This is all important stuff to take to T, when you are ready. This is a marathon not a sprint and you don't have to disclose everything at once or anything until you want to.
I just want to reassure you that the risky behaviour you describe in your teenage years is totally normal for somebody who had suffered the traumas of your childhood. I too engaged in similar behaviour and was abused.
None of this is your fault. You were reacting to a horrible situation and looking for escape. You sound like a very intelligent woman and it is wonderful that you want to resolve this trauma in therapy. The path to healing begins here. Just take it at your own pace.