If you're religious or spiritual, you have to remind yourself that someone/something greater than you allowed you to wake up every morning. If you're agnostic or atheist, you have to find some sort of purpose outside of yourself.
Try volunteering for example and see how much a of difference you can make in someone's life. Thinking that you're a burden on others or that no one will miss you if you were gone is bullshyt. Life is hard, but taking your own life is not going to make it any easier for anyone that cares about you.
Work on yourself overall to gain balance in your life. If you don't exercise, well...then EXERCISE! If you don't read more than posts on The Coli, grab a book or two and learn about something that interests you. I can only assume that some of you lack true knowledge of self. If you're black, you may not even know your TRUE history and culture.