Earlier quoted context omitted.
>I had a bout of this about 20 years ago, so I made a rule for myself: I wasn't allowed to decline an invitation. That approach works great as long as you are currently getting invited to things. If it's been a year since the last time you were invited to anything, that's not going to solve your loneliness problem.
This is true, but trivial. If nobody ever asks you to spend time with them, you are doing something extraordinary to prevent it: never leaving your house, violent aggression, being drunk all the time, etc. You should definitely deal with that situation first. But if you have normal interactions with people on a regular basis, you'll get invitations. They might be tiny or tentative or impersonal, but if engage with qu…
And I do think if you're not in any club (for sports or hobbies or whatever) it gets harder and harder to make friends the older you get (spoken like a true mid-30s person ;). I don't have kids or a dog, so the workplace is next to the best venue to meet new people.
TLDR: I don't think it's in any way rare or weird to not receive invitations if you don't already have a network of friends. This is a catch-22.