Dude, I'm probably almost as young as you and I don't have the experience that some of the other guys that have posted have. But what I've decided to do is to keep myself well rounded so that If something doesn't pan out, I'll have something to fall back on.
Right now I'm working a Facilities dept. doing building maintenance. Along with the HVAC cert., electrician's certs., and a contractor's license that I am studying to get, I'm also enrolled in college working towards my Business Management Degree. Everything is kind of intertwined and related so that if one thing doesn't work out, my experience in other fields will.
On the lines of doing something that you enjoy, I personally feel that if you turn you passion into work, it becomes just that, work. For me, my passion is flying, and I am training for my private pilot's license. I don't think I will ever do anything with it work-wise, but that could always change.
Hope this helps.