After extensive testing, I was diagnosed with major depressive disorder, mixed personality disorder with dependent, avoidant, schizoid traits and dissociative identity disorder. A few years later I did personality disorder testing and got the same result. But I am only speaking from my perspective, I am not a therapist.

Yes, you can have depression and avoidant traits. I was horribly depressed for 5 or 6 years. I am glad to say that for the last year or so I have been doing better. Meds did not help me, I tried over 15 meds of various types were not helpful. Xanax and abilify numbed me some, which kept me from acting on suicidal urges. But I definitely had them.

I avoid interactions with others for various reasons, your reasons sound a lot like mine. While reading what you wrote, I pretty much thought that yeah, your t might be right about the traits. I do want to encourage you, though. In my experience you can find relief from even a PD with (lots of) therapy. My journey has not been easy, still isn't. But I am way, way better than I was.