heck dude, you survived this long, another few months won't hurt. i don't have any answer for you why anybody acts like this, materialism? unhappy with themselves? who knows.
i went through similar situation years ago, pretty much a divorce when i just runed 18 left me and my mom about homeless (lived in an old slide in camper on a lot in north florida) no electric, shower by a hose, really screwed up my high school education and wanting to go to college. all in the mean while, my dad with his "new" family were living quite well in a nice house and all the luxuries.
but i joined up the military, you got college, so no probs.
just concentrate on college, don't let that oportunity slip by, i am starting college this fall, but 12 years later than i wanted to.