it's one of the few things i like in life. don't really know anything else
so mess around
there's not a real market for computer repair. especially not for building new ones. the few old people who'd ask you to fix their computer aren't gonna make you a living
you're still a teenager with presumably not a lot of responsibilities, and plenty of free time
try programming. maybe it'll turn out to be your thing. if not, you still didn't lose anything from trying
if you're just really into... tech support stuff... I guess you could look at some IT positions? like, server farms need people to manage the servers. etc.