deathfun, knock it off. Getting all depressed doesn't solve anything. If you aren't happy with yourself, well, change. It's not easy, but I would say that how you think plays a major part in how you are. How to change how you think? GIGO. Garbage In, Garbage Out.. so take out the trash, surround yourself with friends and acquaintances who are a positive influence and who you would like to become more similar to. You can't change the past, but you can definitely alter the future. You can't control everything, but you can definitely control your slice of the pie, so to speak.
Now, if there are circumstances beyond your control, well, be patient, bide your time... but when the time comes, change. (I'm speaking if you are in a situation where people are a bad influence, and you can't help it: they are your parent(s), or teacher(s), or everyone in your school. Although even in that situation you can still attempt to be a positive influence, do your part.)