Can you afford to move out of their house and live on your own?
Unfortunately as long as you remain there you will continue to be maltreated which will only make your condition progressively grow worse.
I'm sorry that you have been abused and scapegoated by your parents and siblings this way ... Often these kinds of parents turn siblings against one another so that the one child that's receiving the brunt of the abuse has no one to turn to for comfort.
I truly hope you can find a way to distance yourself from them and find the help and support you need to begin recovering from this most awful form of abuse!
Sincerely,
Pfrog!