PS - if you went to the recruiter and told them you were 18 now, they'll forgive you later.
PPS - my apologies to other posters who suggested military service before I did - I didn't read through the entire thread before I posted.
Others have said, "get a job". Doing WHAT? You have no real credentials right now. Unless you seek a career stocking supermarket shelves, you can do better than this.
Others say "Sue the WT!" HOW will you pay your lawyers? Where will you live while you're suing the WT? Bad plan.
Others say, "pursue your education" How will you pay for that education and where will you live?
Talk to your school counselors and ask them what they think of military service. If they discourage you, ignore them and talk to a recruiter. YES, you will have to maintain a "teachable" attitude to make it a success. That is what most recruits do. If you're a jackass, the military will toss you out and you can then follow all these other not-so-excellent ideas.
The military will provide you with housing, training, discipline and loads of other good things if you are smart enough to behave yourself and follow instructions without developing a self-destructive attitude. When you finish you will prepared to manage the rest of your life.