Go to your local community college. THey will accept almost anyone, and they teach classes at almost all levels. Most of them are cheap enough that you won't be out any serious $$$ if you attend for a while and can't hack it (although I'm sure you can). You'll need to decide on a major quickly, since you will only be there for 2 years if you are full-time.
Talk to a guidance counselor at the school and try to come up with a major that interests you. Once you get that 2 year degree in hand, you'll be ready to hit the world and make some money. WEll, maybe. Anyway, if you find that you want to continue with school, you'll most likely be able to transfer to a four year school and finish up the four year degree pretty easily.