Unless you're one of the few people who knows what they want from an early age, the only way you figure out what you want in life is to try a bunch of stuff and pay attention to how it goes. Eventually, you'll start piecing together the most enjoyable and important things for you. In all likelihood, many of those things will change over time, but some of them may stick.
For me, I found surfing at the age of 26. It's a crazy hard sport to pick up at a late age, but I sort of fell in love. Surfing replaced meditation, journaling, and other forms of exercise, and it gave me even more than any of those things could. It produced a level of zen and fulfillment that only two or three other activities do. I only figured that out by exploring like a mad man in my twenties, and I got lucky to stumble upon surfing.
It's the people who are too afraid to look and who get stuck in a comfortable path who don't ever figure out the real joys of their life.