OP, I'm sorry for all that you experienced. I'm glad that at (what's to me) a young age you know about CPTSD and you're seeking treatment.

To my mind when a parent does this kind of everything-is-your-fault stuff it translates not only as being a punching bag but also as a form of brainwashing.

I ended up with a lot of wounds too if it helps to know. My mother used me as a confidant for topics I should have never heard about, including that it was a tough decision on whether or not to abort me. Looking back on it now, I can't believe someone would say these things to their child... My father projected all his own insecurities onto me and rode me endlessly. He so much wanted to exorcise things that made him feel bad about himself that he used me as a vehicle in which to do so.

So anyway, our stories are different but I can certainly relate. I hope things improve rapidly once you find a good therapist.