I feel the same way right now, so I guess I'm a hypocrite by saying this, but:

You have to keep going. You would be hurting so many people if you ended your life. Life is about living and enjoying yourself. And life is too short to begin with. Why not go out there and have the time of your life? Do the things you enjoy. Hang out with friends, go out for pizza and ice cream and pig out, write the greatest novel of all time, or just dance like crazy by yourself in your room. You'll definitely feel better, I promise you. But if doing fun things still doesn't help, I recommend talking to someone you trust to help you. If things escalate, talking to a professional never hurts.