Everything I can get my brain interested in is a solo activity. I feel like whenever I try to even think about doing something that requires me to initiate contact with people, some unconscious part of me "resets" my thoughts and they just get stuck in a useless loop. On the rare occasion that I manage to override that and go somewhere, I am unable to engage with people even though I want to.

I don't hate interacting with people; quite the opposite in fact. I just for some unknown reason am seemingly completely incapable of initiating interaction with unfamiliar people (and even initiating anything with people I know is rare for me to do).