Don't want to be one of them, but can't live being different either.

Feeling incredibly weird, useless, boring, mundane and bleak. It's like everything I say or do, I have already said or done before; every movement seems so mechanical, almost like a pattern my body follows. And my mind is driving me into insanity - or something that is close to that. Thoughts are messed up and unclear, but mostly negative. What do I do now?