Gold shift, I am sorry your parents were so mean to you! I think if you were to remove yourself from this abusive situation it would make life easier for you and might actually make them realise that they treated you wrongly!
They would probably start to pick on their beloved son if you weren't there! Some mothers just need to vent their anger on someone and unfortunately it is usually their daughter as people seem to think girls can handle it better! What they don't realise is the permanent mental scar they create!
As for your t what approach or therapy does she practise? I ask because my old t was a humanistic and she said she doesn't give advice or she never commented on my parents behaviour , she preferred for the client to find their own solutions to their problems which is incredibly frustrating! Since then I am going to a counselling psychologist and she. Tells me why she thinks my gaseous acted this way and why people do this and that and I find it much more helpful now that I can understand it a bit better so maybe a new t with a new style might suit you better! None of this is your fault though