You must find your center, young grasshopper. Suggestions:
Do something that promotes in you a stronger sense of self...go hiking in the mountains for a few days or something by yourself. Buy a motorcycle and ride it cross-country.
Exercise. Gets the endorphins going, plus the obvious positive change in physique after sticking with it for a while.
Get a dog. A dog forces you to wake up at a decent hour (to feed them), you have to walk them when you might otherwise sit on your ass all day. Then you've got the added benefit of easily picking up chicks (the good ones are usually animal lovers.)
Grow a beard. Do this while you're hiking in the mountains or riding motorcycles cross-country. Don't ask why, and don't argue with me on this one. Chuck Norris has a beard, you think he's got low confidence? :crackup:
...and feelingloved suggested getting lots of sleep, but anything over 8 to 8 1/2 hours will affect you negatively--too much sleep is almost as bad as too little. Plus sleeping a lot is a pretty common symptom of depression.