You already have a therapist. That is excellent, and a very good move to consult the Internet (this once only

) on your part since your problem involves the people who would normally be acting as your coach.
First off, I'm pretty sure this doesn't constitute abuse, but I can't say for sure across the Internet. Secondly, your framework is not constructive. Regardless of where the blame for your problem lies (and I don't mean to imply it doesn't lie somewhere), it is not a good idea to try to fix a psychological problem by finding the cause and then 'cutting it out' in either a hard, such as by emancipation in your case, or soft manner, such as by learning to block out your parents. This will leave you with both the same lacking adaptability when faced with a similar future problem, as well as a learned avoidant behavior. Whatever the hardships until now, this is a problem you will need to solve.
I don't mean to patronize you here so I'll keep the age-stuff curt, but on some level I think you should realize that you're 14:you're young and dumb and yadda yadda (you'll totally get this part in about ten years), but on the other hand and more importantly, this is also when you acquire the brains to really put two and two together and figure out that ma and pa are just people like everyone else, and people
really tend to come with a lot of problems and baggage. It's almost impossible, or at least incredibly hard to imagine the decisions and forces that have shaped people in their 40s and up through their lives for a fourteen year old.
On some level, I think a lot of this problem stems from the fact that the situation is changing. You're obviously an intelligent and more importantly highly aware young lady, and for parents, it can require tremendous mental effort to understand and
change your behavior to accord a new attitude, and on top of that, you're probably not making it very easy

. Try to imagine how it feels when all at once, a person who has been almost unquestioningly positive and loving, and who you yourself love very much, can suddely perceive many of your shortcomings and in some cases, tends to get very pointy about them - sort of a "don't know your own strength" situation.
On their part, they fail to see that what used to be acceptable behavior for them is no longer acceptable (or helpful). It's important to be reasonably strict with a five, eight, ten year old, but at some point, behavior has to change to allow for independence, but there still has to be some degree of safety net and a
reasonable degree of parental guidance (I wish I could think of a tastier way to put that...). This is an honest to your preferred deity difficult task for a parent, because it's not as clear-cut as you'd think to figure out what constitutes "safe independence" with all the crazy crap you kids think up.
This is a quite common and frankly quite logical situation. Concretely, you need to assert yourself without doing so by asserting yourself in the negative of your parents. You do this most successfully by showing (not telling) your parents that your way is a viable alternative to their way for you. Use your therapist to help you understand why your parents act the way they do towards you, so that you can understand how to act truly independently of your parents, instead of for or against them. Remember that your parents only want the best for you, even if sometimes they get pretty confused about it, and work with that. If doing what they say doesn't make you happy, then don't do what they say. If that doesn't make you happy, make up something new.
You still
have to listen to your parents (not because they're your parents, but because you live with and depend on them and that's just a thing you'll have to get used to when living with and depending on human beings), but you don't
have to behave according to what they say, and you don't
have to justify yourself to them, though that goes both ways - the results will speak for themselves, for better or worse.