You want the good answer or the real answer?
My life, an ultimately random chance of event, is interesting and pleasurable enough for me to wish to continue it. As it is of no inconvenience to myself, I see no reason to end it. I live, I laugh, I have fun. If my personal life weren't fun, then the situation would be entirely different, and perhaps suicide would be a foreseeable route. Without dwelling too much on my personal life, I'll let out that I am a nihilist, in the sense that life is meaningless, but mixed with my hedonistic feelings, I live my life of no point for personal pleasure. Entirely selfish, perhaps, but I have one hell of a time. (Er, just because this is in the abortion thread, one disclaimer: I promise to not have a stupid sex life?)
On the less me more everyone else level: I'm an only child to a mom who has just gone through a divorce. Killing myself runs the risk of killing her, and I don't want my selfish actions doing that to my mom. That's what I meant with my earlier post of living in debt to your parents. I'm pretty much guilted into living when it comes down to it, woohoo.
So, not having been born wouldn't really devastate me. Again, I'm indifferent towards it. Life is cool, death is peaceful. *shrug*