I’m so, so sorry you went through such a difficult time. I ache for that little girl. I think there are some things we don’t get “over” and shouldn’t. Remembering can be a way to prevent painful things from happening again. But we can put them in the past and move on.
There is one big positive part of your story that will help you rebuild your resilience. Your parents believed you and did what they could to help. They were not effective but at least you know that they tried. Hold onto that. In addition, I see a core of strength in you that has somehow let you keep on keeping on despite a horrific history. Hold onto that too.
I’m assuming that you are seeing a therapist since you have a number of diagnoses. If so, working hard with your therapist is where you start. If not, please give therapy a chance. It will take work. It will take time. It will take the pain of revisiting what went on in order to then put it in a place where it doesn’t dominate your life. But people like you who have done such difficult emotional work regularly tell me it was worth it. The past can be put where it belongs — in the past — and you can move toward a happier, confident and successful present and future.
I wish you well.