I've had the luxury of being able to completely cut off one relative that was extremely toxic. I say luxury because circumstances made it possible to live far away from them. I realize not everyone has these choices. I think if you're stuck in a family and place that is suffocating you and you don't have the finances to make a big move that gives you distance it would absolutely suck. I would suggest you try and carve out as much life outside of family as you can, whether it be via internet or making a big effort to get a social group IRL that is completely separate from them. I know that's not really enough sometimes, but it can be a mental lifesaver.