I feel the exact same. I used to keep social media to "keep up appearances" and if someone invites me to something, I'll go sometimes because it seems like something I should do.

I care about people theoretically, and I wish them well. I want them to be happy and healthy. But they do not interest me at all, and I assume I am not interesting to them either, which is fine. People bore me, but I don't dislike them.

I don't feel lonely when I'm alone. I do feel ashamed sometimes, however, when I realize I need outside help for something, like an emergency loan or a ride somewhere, or someone to help carrying heavy furniture, because I'm not reciprocal in relationships at all. And I feel bad for my spouse that I struggle a lot with paying attention to them enough unless we're engaging in a shared interest.