School should be your top priority though. Even if you don't know what you want out of life yet as far as what you want to do, school is going to be the way to get you there. Work will give you the experience you need to get what you want..
Lastly.. When I was 18, I made a list in basic training of what I wanted to do with my life. What truly would make me happy. "If I died tomorrow, would I have done these things?" sort of list. Every year, around that same time, I re-create that list. I don't look at the old one, I just make another one. I think it sort of helps me keep on track and never lose sight of what I need out of life. I think "Eat delicious food" has been on there every year.