... Wait, they're getting child support and charging you for rent, utilities, forcing you to buy your own necessities, etc, while you're still a minor in their care?? That sounds shady as hell. I'm not a lawyer and I don't know what state you live in, so I'm not sure if it's outright fraud. But definitely something to ask a free lawyer about. I'm so upset on your behalf!

Edit: if you want any help or moral support looking up laws and pro-bono lawyers in your area, you're welcome to pm me! I have some free time on my hands right now and I know looking through options alone can be overwhelming.