Thank you for writing. I can’t tell you what to do but I will ask you to consider this: One of the goals of therapy is to give us a safe place to work through old issues that block our lives. The work you’ve done with your therapist so far has been laying that foundation of trust and safety. I’m very happy for you that things have worked out so far.
I can guarentee that your therapist will at some point say or do something (or maybe not say or do something) that will offend you or raise all your issues about trust. It’s inevitable because therapists are people and people make mistakes. But that isn’t the reason to leave treatment! That’s exactly the point at which therapy will become really, really useful. Stick with your discomfort and share it with the therapist. Then you can both look at it and help you figure out how to get through it. When people care enough to work through tough times with each other, the relationship grows. They learn what matters to each other and how to negotiate conflict, disappointments, and disagreements. The relationship becomes more rich and complex. Working on your relationship with a trusted therapist can help you understand what you contribute to difficulties and can teach you skills for managing yourself and inviting cooperation and friendship from others.
I agree that mental health diagnoses tend to be overused. They are not intended to be labels carved in stone. Rather they are a way for professionals to name a common human problem when communicating with each other. Yes, you have challenges in getting comfortable with other people. But a combination of motivation and willingness on your part and some skillful treatment on the therapist’s part can help you do much, much better.
I wish you well.