How to stop feeling worthless and hopeless?

I pretty much hate my life. I have found out that I'm pretty much the biggest loser from my high school cl. I have very few friends, and girls can't stand me. I blew the only potential shot I ever had with a girl I wanted since high school. I'm always worrying about getting embarred so I don't try anything, therefore I never accomplish anything. I harp on getting made fun of when I was younger. I have no real future, I'm in college but have no career that is for me. I've thought about suicide a lot, but I know I won't do it because I know I'll fail and be the guy who couldn't kill himself. Please help.