You should get into better habits with your writing, as something like this will seriously hurt you in college. I'm going to show you an example of what you're going to see on most of your papers.
Hi, I am 18 year
s old
and have been studying*1 and sometime
s it feels like I am
totally pissed of my life*2. I can rarely sleep early
at/in the night
causing me to sleep in as late as noon
sometimes. My work has been dead
and its because of my laz
iness.
How to end it up, I am now quite angry with myself and sometime
s it feels like
that its I'm just a body
; my soul has gone miles away
, leaving me
. My*3 fun has ended
. 
*1 This is needless information. It has no relevance to the overall point and thus is a waste of time mentioning.
*2 Avoid esoteric slang terms such as this. A simple "tired of my life" will suffice. Also avoid vulgar terms such as "pissed" or any variation of.
*3 My main reason for this edit, by the way your post is worded, you imply that the ideology of fun has ended, when fun on a personal level has ended, though this edit can be debated, this kind of wording can turn an A paper into a B+ paper.
Also note that a majority of people scowl usage of first person, though due to the personal meaning of this writing I figure it won't hurt you here at all.
