Do you fantasize about romance a lot while having no interest in it, in real life?
Do you experience internal emotions about fantasy things, but little or no emotional response to real life situations/people?

A lot of schizoids are reportedly quite lonely on a very deep level, some do not even recognize it.

Do you identify with SPD at all?

Schizoid Personality Disorder Symptoms | Psych Central

Of course it could be many other things, and only you would be able to know for sure, from the inside looking out. But I'm curious because lately with lots of reading on the different PDs, I'm finding that I relate a lot to SPD, but it's a very covert, secretive sort of thing for me, I guess. But I get the same outward effect going on, as far as having a hard time connecting with real life people.

I think part of it can also be trauma-related.