I have anxiety too, controlled with medication and therapy. Personally I don't feel it has held me back socially but I can see how some would have a different experience.I have no friends either. I'm 45 now, and had loads of friends till I hit 30. Every weekend we were out, and during the week we would see each other.
I now feel really lonely, as I live on my own, and wouldn't be close to my family.
I have anxiety, and find it hard to make a connection with people.
I am in a walking group, great as it is, I haven't made friends with anyone. I have chats with them, but that's as far as it goes.
I am in a meet up group and we are going out next week, but again, I haven't really gelled with anyone.
I'm fine meeting new people but I can struggle after the initial introductions to keep the conversation going. I rely on my partner often in social situations. I don't have a great sense of humour so when someone in a social situation makes a joke or tries to be funny, I usually can't laugh, and it can come across as a bit strange to people who don't know me and stops me gelling with them. It used to bother me but I don't care anymore.
I know some people who prefer their own company and have done solo travelling around the world for 6 months or longer. I think I'd do it if I was single. I don't want to leave my partner and cat, and can't afford to take a career break of unpaid leave right now.