I can't bring myself to be interested in people
There are people I have seen multiple times a week for over a year and I can't remember their names. When people give me their numbers, I never call back. When I see people I know and am sometimes friendly with are talking, I frequently avoid them just because talking seems tiring and I'd rather not.
I'm nearly thirty and this is really settling in. My list of contacts on my phone is less than 10 and mostly family. And I'm not close to them.
I go to meetups, I go to martial arts classes, I do online dating. I'm good at superficial conversation. I can be friendly, and people seem to like me. I'm not socially anxious or anything. But I can't bring myself to care about the people I interact with.
I'm a little lonely, but mostly okay. I just wish I did care about people. Everyone else seems to care more than I do.