Oh god don't give up now. Get the damn diploma. Go to college if you can too. Work if you want along the way, but don't give up school. It is not about what you learn but the paper they give you at the end. I know people that have done well with only HS or less, but they are the EXCEPTION.
Money may look good now, but you need to look to the future, hard to do at 18.
Scott