I'm sorry to hear of your struggles.
For money, can you teach martial arts? If you've competed and done well you might be able to use those credentials to get some private students. You could charge, say, $10 or $12 an hour and it would still be a bargain for the students, plus some people might prefer one-on-one training even if it's in a park instead of a dojo. Maybe you could reserve some time at a junior college or high school gym and set up some mats? Just a thought.
And there's always trade school. I know you said you weren't very good at school, but you sound very sharp. The government is giving a lot of money to students right now, so maybe you could get a grant or a student loan?
Anyway, if you're interested in Buddhism, this is a classic meditation guide and it's very cost effective (free is an excellent price!). Meditation practice might be just what you need right now.http://www.urbandharma.org/udharma4/mpe.html
One of the main teachings in Buddhism is that all conditioned things are impermanent, including your current struggles.
Hang in there, and good luck.