I used to feel the exact way as you, I decided to go underground for a year and work hard and just keep my head down and focus on myself. My days consisted of eating, work, gym, Xbox.
It was pretty antisocial but I was leaving the house at 5:30 in the morning and returning at 6:30, with that kind of timeframe I didn't really want to (couldn't either) head out and see people, and I was working 50 hour weeks so my weekends were definitely "me time".
Find something you can focus on and concentrate on yourself instead of others. I use to think the exact same as you but you *will* find out that a year after finishing high school everyone calms down, stops being jerks as they get off their high horses and come back to reality and where their place is in this world.
Do you enjoy raves or clubs? head out to some and start making friends! Or maybe video games or something, it really is easy to make friends, call that my own personality but go back 18 months ago I was exactly in the same boat as you and now I'm pretty happy with my life, I have good friends a nice car and a great job that pays well.
Everything gets better, trust me.