I most likely suffer from either schizoid PD or avoidant PD, undiagnosed. The thing is, I don't avoid people because I'm afraid I'll embarrass myself - I avoid people because they're too much trouble, and every relationship ever ends in betrayal. Why would I want that? Of course, I'm only human and sometimes crave sex and intimacy. But I feel like not only it's too late for me, I wouldn't be able to cope with another person.
Aside from that symptom, I'm also extremely cold and distant. Not in a quirky way. I mean in a way I have no facial expression at all, and people often wonder if I lack empathy or even emotions. I have no immediate friends aside from close family, only via internet. So yeah, I don't have that wish to be close to others as much as avoidant people do, or extreme social anxiety, I just don't care. But I could be avoidant, I don't know tbh.