I agree with Kestra, you will have to leave behind some of your interests to pursue any given thing.
Narrow it down. If one of those many interests is something that will be big sometime soon, go for it. And look at a couple of things first. What do you enjoy doing? What are you good at? What do people like and dislike? Can you go in a certain direction with the least amount of dislikes?
I've gotten down to writing and web designing, and I'm doing both for a little while. Try two of your favorite interests as non-professional (is amateur the right word?), and have friends and family look over them. Then, whatever you are best at, go for it!