Iirc, you do not work, but you collect disability. Is that right? You say your mom works full time. Does your dad pitch in at home?
If your parents both work full time, and you are home all day not working, then, imo, you should be working at home as much as you can, like a housekeeper. The Bible says that if you don't work, you don't eat. It also says that we are to work 6 days and then rest on the 7th. If the only "work" you do are household chores, then that should be your work - even when you contribute financially to the home with your disability payments.
The Bible also talks about working as though working to the Lord. Whatever you do, put your whole heart and energy into it. If you can't put your heart and energy into it cheerfully as if you were serving the Lord, then it is better not to do it at all. But that is not really fair to your folks. If your mom is not saved, working at home and doing it cheerfully as you would serve Jesus, would be a good testimony to what it means to serve the Lord.
If she complains about it, then let her know that you will do what you will do, and if she is unhappy, then she can go over it more until she is pleased with the outcome - but at least you gave her a good starting point and make her life a little easier.
And in the meantime, if you want to leave, then keep your eyes open for a shared rental, house-sitting, live-in caregiver for children or elderly, or other arrangement where you could move out.
I am curious, though. If there are no places to rent, how do young people manage to grow up and leave home? Where do newly married or newly independent people move to?