I became a musician because I love music, and that is what has sustained me; it's not because I thought it was a great way to make a living. Music saved my life.
When I was 17 or 18 and it was time to figure out what to do with my life, I realized that I didn't enjoy anything as much as I enjoyed playing music. I felt that I had no choice: that I had to become a musician.
I think a valid approach to being a musician is to take all of the experience of your life and filter it through your personality and send it back out there, and that's what art is.