I bet that you really don't want to hear this but i'd suggest getting a job at a store or something like that until you have found a good career choice or can make enough money with art to live off, I think it's better to ensure a stable income instead of struggling, I've been there too.
If you have unwanted video games/video game systems or accessories, brand new clothes with tags on them, or anything like that, sell them online on eBay. You can take the games and stuff specifically to GameStop but they don't tend to pay well for that stuff. You've probably seen the memes.
This will get you quick cash (maybe) but some people make a business of buying stuff then reselling them. Like those pawn shop type stores.