How did you discover what to do with your life?

With college looming, I'm starting to grow worried on what to do for a living. It's not that I don't want to learn: On the contrary, I have lots of different subjects I'm interested in, from history to English to music. The problem is that I want to pick what's right - really right - for me in the long term. I don't want to look back one day and regret the decision that I made.So how did you discover what to do for a living? A lot of people say that they "just knew" what their careers would be; others have regrets because they didn't take a risk and study to be a musician or a writer. Yet others search for years in many subjects before they finally realize what they want to do. How about you? Any recollections or advice on picking a career?Thanks for any input