My brother's behaviour concerns me - should I be worried?

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My brother has always been "abnormal" but lately he's been doing/saying things that are concerning to me. And now that I think back at what it was like with him growing up, adding it all together it seems like something I should be worried about.

-He always wrote violent stories and drew violent pictures. A lot of people in our family for some reason thought it was cute and funny and quirky, but only my stepmom who's a child therapist was concerned. She told him to stop, but since we don't live with her he continued. They've gotten worse over time. I even found a comic he drew of a boy killing his parents then laughing. This was shortly after he got in trouble.

-He's gotten in trouble for violence a lot at school. My mom pulled him out of karate because he used some on a kid at school. He got in fights in elementary and middle school.

-My Dad has a long fuse and lets his anger build. When he finally gets upset he yells and sometimes breaks something if you provoke him enough, but he's never hit anyone or said things with the intent of hurting people. Sometimes he says things that hurt but he later apologizes. MY brother however, he gets mad at things most people won't and when he does he doesn't necessarily get violent but he gets rough kind of, like slam things are, push you out of the way, etc. But he says things specifically with the intent of hurting people, and always chooses the lowest blows possible like he knows exactly what it would take to hurt that person so much that they would be defeated in the argument. For example, lately I've had self esteem issues with my looks because I have acne and I dye my hair a lot and change my makeup because I want to find something that works for me, I was called ugly a lot in elementary school, so it's something I'm trying to get through and go to therapy for. Well, I said something that apparently hurt his feelings, but it wasn't something most people would get upset over andin fact I didn't have any idea it would bother him. I wouldn;t hurt him on purpose. Then he just flatly said, "Well, you're ugly." and another time in a similar situation he said "You have no one and no guy or girl will ever love you" (I'm gay). I'd never been in a relationhip before at that point. Both times I got upset and locked myself in my room all day to cry. (i know it seems like overreacting, but those are really personal). When he say me crying he smirked. He never apologized and when I told him to he insisted that I apologize to him. When I did, he just walked off. Now that I think about it he never sincerely apologized to anyone for anything. He calls girls and guys at our school that he hates "fat and ugly" or stupid or something worse. Whatever would hurt them. He never apologized to any of them.

-He does whatever he can to be the center of attention. When we were little he'd sing and preform skits in fron of everyone at times where he wasn't meant to be the center of attention because he couldn't stand to see other people have it. Like weddings and birthdays he'll do anything to draw the attention away from the focus and onto him. He's in drama now and even when he's a small character he knows what to do to be the star of the show. On facebook he posts a new status like every 20 minutes when he's on. He tags people in pictures then leaves 1000 comments on it so people get notifications. Some people have deleted him or blocked him all together because of this.
 
-He acts intellecualy superior to everyone. HE always corrects peoples grammar when they are in the middle of talking then insults their intelligence because of it. I'm an atheist and he is to, but I have many Christian friends. We were raised very Christian and our mother is extremely religious and so is our extended family, so I try to be very polite and open minded about that with them. I don't discuss mhy lack of belief and something like Thanksgiving when the family prays I am polite about it, where as my brother will insut people or roll his eyes or try to get out of it. He starts uncalled for religious debates with people and instead of using real arguments he just attacks them. His first girlfriend broke up with him because she was a Christian and he would always poke fun of it around her. He treated her like an idiot and I witnessed it, always correcting her spelling or grammar or magnifying those silly mistakes we make. He brags about his intelligence all the time, however he fails many classes because he doesn't do work. Ever.

-He's obsessed with books and movies that are violent or have violent undertones such as Fight Club, Death Note, A Clockwork Orange, to name a few. I like a lot of the things he likes but he seems to like it mainly for the darkness of it.

-He makes jokes about things no normal person would joke about - pedophilia, rape, 9/11, slavery

-He tries to be controversial on purpose to stir reactions out of people and he prides himself in this. If he gets a negative reaction out of this it makes his day. He kissed one of his gay guy friends even though he is straight just so people would make fun of him. He laughed when some guy called him a faggot and it seemed to make him happy.

-He’s run away twice, and gets in trouble a lot. He overtly does illegal things, but stupid illegal things like trespassing  or climbing roofs of public places. He got drunk only one time and brags about it all the time like he did something soooo bad and pulled one over on his parents. He told me the other day that he wants to do more illegal things. He does it just for the sake of it.

-No punishments my parents give him work. Any time he gets grounded our parents take everything away and give him a long lecture and it just doesn’t get through to him. If he changes his behavior it’s because he wants his privleges. You can tell he feels no remorse for what he did even if it’s something really bad. He never admits wrongdoing and complains to me about our mother saying she’s just a fat stupid Christian and she doesn’t know anything and blames her for him getting in trouble somehow.

-He doesn’t have any sense of urgency. He almost failed four classes and didn’t care. The other day, my five year old sister went missing in a parking lot. We later found out my cousin had her, but I was panicking, looking around and asking people if they saw her. My brother had his hands in his pockets and just dragged his feet. His facial expression just looked bored like he didn’t care. I accused him of not caring about the situation and he yelled at me and stormed off.

-The other day, myh cousin was listening to a song about Columbine. My brother asked what that was and when I told him he seemed really interested and fascinated. I found him looking up stuff about it later.

- Yesterday he said “I want to murder something in my life time. That’s what Iwant to do before I die. “ He makes jokes like that all the time, but I just said “Oh shut up that’s not funny.” HE just got quiet.

Ever since yesterday I was thinking about this. And I was wondering if this is concerning behavior that Ishould maybe talk to parents about or is it normal for boys trying to find their identity or something? Am I overreacting?

Sorry for the length.

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I think you pretty much have your brother worked out. You know his motivations for behavour ie: to get attention or to provoke a reaction or to feel superier etc etc.. I know people just like this, from Opposition Defiant Disorder as children to Conduct Disorder in adults. They are very difficult people as they ENJOY annoying people.

That aside for a moment as you also mention his violent drawings and his murderous intent of late. Which is very unsettling. Here in the UK a guy has just got a life sentence for murder and on his first court appearces refered to himself as The Crossbow Canibal, I was reminded of this as he too was an attention seeker. And I quote from one news source
"Worryingly, Griffiths was identified as a violent weirdo back in 1987, aged 17, when he was nicked for slashing a store manager across the face while shoplifting.
He was jailed for three years. After his release, a psychiatrist said he had fantasies and displayed a "preoccupation with murder - particularly multiple murder".
Griffiths told the doctor that he saw himself as a murderer, but not until his early thirties.
He was diagnosed as a "sadistic, schizoid, psychopath".

Your brother may not go down a route like this it is very rare, but may say things to shock you, or get a reaction because ultimately they are control freaks and need to control the emotions of others as well as the situation.

I don't think you are over-reacting at all, you know the kind of person he is and I imagine you trust your instincts and this is a bad feeling you get and feel you should act upon it, why you are here may be.
A person can't be convicted upon suspicians. What can you do?
If he talks of this again maybe suggest to him he could benefit from psychiatry assessment because you worry he could kill. Being attention seekers these people are usually too happy to talk to others about themselves. So maybe he would agree.
Because you have such insight into your brothers behavours I would advice you to always follow your instincs because they are probably right, and don't let others talk you out of what you instinctively know.