It sounds like you're pretty introverted. Nothing wrong with that - I am too. We all have different needs and desires and our social needs just happen to be satisfied with just a few people.

The nice thing about doing stuff by and for yourself is that you've got more of interest to offer when you do decide to interact. Restoring old houses sounds fascinating, for example.

My boss likes to end conversations with customers by saying, "Keep in touch with yourself." I think it's a funny way of saying, Nice to see you. No rush to do it again soon, though!