I agree wholeheartedly of doing something that you believe is valuable.

The process of figuring out what's valuable is different from person to person. Some people know from a young age. Others figure it out in college or post-education. My values have been shaped and refined over the course of high school, college, and work. The high level picture may not be clear, but I believe it's beneficial to hone in on what you find valuable and see where it takes you.