Are you kidding? Stay in school! After all, plumbers aren't a bunch of dropouts. We have a specific set of skills that are highly sought after. First of all, you (yes you specifically) need to improve your English and grammar. I don't say this to sound condescending, but seriously, read and critique your own post. Secondly, a very strong mathematical aptitude is required. Third, a good understanding of the sciences comes in quite handy.
Finish school. You'll never regret your decision to do so.