No one can give you a reason to continue, that is something that you have to find for yourself. Though that sometimes means that you have to get off your ass and start looking.
I mean if things really are that bad then change something, it's as simple as that. If you don't like your college then drop it, if your friends aren't there then find new ones, if you are fat then eat less or work out.
No one else can live your life for you and everyone has their own problems, you just have to learn to deal with yours.