You need some kind of education. If you're having trouble (real trouble, nothing to do with advanced clases) with High school I would advise against going to uni/college. Learn a trade. Plumbers make more money than most engineers anyway.

Avoid becoming an unskilled labourer if at all possible.

If you want to own your own business someday, the type where you actually have employees (instead of being something like an independant plumber) you do an education. Math is your friend when it comes to money. The 'pointless' courses allow you to ineract socially with other 'learned' people. They won't respect you if they have to use small words for you to understand them.

Honestly, if you're having problems and doubts like it sounds you do, take a good long look at your life and ask yourself a couple of things: What do you want to do with your life ? What are your strong points and your weaknesses ? Do those fit in with your ambitions ? How important is money to you ? (and really, do the math here, what would you like to have and how much does it cost ?).