Unfortunately, there's not really any law against them treating you this way, as you probably already know. I'm sorry you are stuck in this miserable situation. Life really sucks when you are young and dependent on others who fail you this badly.

They're not going to change. Your hope lies in eventually getting out of this home, which you will be able to do one day. Meantime, network with others who may understand your difficulty. See what may exist in your community by way of support for persons with cross-gender identity. If you're on a small town, you may need to take a bus to the nearest decent size city to connect with sources of support. For now, you may have to keep to yourself at home for your own emotional protection. No point letting down your guard just to have them take pot shots at you. They are ignorant and probably don't know how else to act. Ultimately, they will be the losers.

Remember: the less they do for you, the less you owe them. That may be a liberating reality for you some day.