TPND, your adoptive parents were wrong for what they did. I don't know their reasons or what their problems were but I would bet money that they did have some problems. You were mistreated and you didn't deserve that....... You weren't mistreated because of anything that you did. You were mistreated because your adoptive parents didn't do the right or best things to raise you. People can be wrong. People make mistakes everyday somewhere in the world.

I see why you isolate, because you don't trust? You can learn to trust again slowly. To trust you have to understand what is going on with yourself pretty well and understand how you got to the point of not trusting (upbringing). You can then empower yourself once you understand why you feel so powerless (because your adoptive family took away your power at every turn). Then you have to learn who you can and who you can't trust and learn how to protect yourself (empowering yourself is key to protecting yourself). Your T can help you with this.