Hi BW,
You'd have to be crazy not to be depressed in your situation. IMO, the real core of the problem is in the culture. The US has the #1 depression rate in the world. See Here
My advise would be to "spin straw into gold", try to find a new surrogate family and social network. I would strongly consider some kind of foreign exchange/education. Search for ways to fund it. Your soon free from your old family, forge a path for yourself and your siblings.
You want to cure depression, get a passport and get the hell out of here. That's what I'm gonna do as soon as I'm free of my parental care taking responsibilities.
All the best,
HBH