It's been a few years since I was applying to colleges, but from what I remember, Cooper Union is a VERY, VERY good school. And personally, in my mind, to even be able to apply there is a HUGE accomplishment and you should be proud of yourself.

I also agree with what others have said. Remember what you KNOW to be true, and try to ignore what others are making you feel. Take pride in your accomplishments and reward yourself for them (easier said than done, I know. This is something I'm working on in T right now).

I'd also suggest trying to get some exercise if you can. Maybe something unusual just to get you moving.