a column by cary tennis at salon.com : Dear Cary, I am 24 years old and I am tired. Tired of my life and tired of my mind. I am an intelligent guy; I have a degree and should be making more of life. But, to be honest, I don't have a clue what I want. In fact, I almost feel like I don't want anything. Yes, I have the brain to be a successful businessman. I have the creativity to work in TV. I have the understanding of people to work as a therapist of some sort. Yet, I find myself in debt and working dead-end jobs because nothing appeals enough. For a time I wanted to act, then I wanted to direct. But whatever I choose, I come to a point where I always end up thinking, "Well, there must be more to life than this. I don't wanna train all those years just for that!" So, come on, what the hell's wrong with me? Actually, I love writing. But there's a problem. I can't find anything to write about. I haven't written in over a year. And not...