I'm 21, I had an interest in CNC machines early in my teens, and I bought a small machine when I was 18. I continue to wonder what I'll do for work since the economy isn't great, and getting a decent job isn't easy. What I did is I kept this interest of mine going, making a few bucks on the way, and I've kept college/education going.
Perhaps you could pursue some form of education, work in what interests you, and see which one pans out or perhaps both if your degree/certificate/etc works with your interest,
For me I'm making a decent bit selling specialized wood work, then I have my father's occasional work, and then (lots of testing out then online college) college which I'm loathing but must finish since I'm 35 credits from my bachelors in boring business
Hopefully I get the first option, if not the second might keep me somewhat going (not really as contracting is basically dead), or conversely I could push papers....
I'm definitely not making bank selling things but it's actually shaping up decently and maybe it will go somewhere. Perhaps if you keep your interest well fed and wait some then you can get an idea of what is best for you.