I would suggest that the first answer to your question.........what brings you to therapy.........is that you have trust issues. That sounds like a reasonable answer without having to dive into all the other issues upfront. Also, you ask "how am I supposed to find someone I can trust when I am necessarily giving them the power to hurt me like that on a whim?" That is a good question. I am not minimizing your experiences, but try rewording that.
How am I supposed to find someone I can trust when I am necessarily giving them the power to HELP me?
Unfortunately, in order to get better or make progress you have to take a risk. There is no other way around it. Either that or stay where you are at. ((((((hugs)))))) Remember that although you have been burned before, you are worth the effort and until you open up and jump.........you will stay where you are at. However, it does take time. Take it little by little. Don't be too hard on yourself. And not all Ts are created equal. I hope this helps.