How do I get out of a major depressive episode?

It sounds like you feel like you really have nothing at all to be happy about. Don't worry. I'm 15 and i've often felt like i don't know who i am, what i want or where the hell i'm going. Strange thing is, most of my friends feel the same way. Don't worry about it! Do what you want, don't listen to 'society' or whatever.