I posted on AIBU about my situation and mumsnetters were actually quite helpful!
It also made me realise that my main problem is that I feel lonely.
TLDR: I've been working for home for the past 13 years. We live in a pretty isolated bit of Britain but can't move. I really dislike WFH but it's the only way to get a decent salary (because there are no decently paid local jobs).
I only have two local friends (who actually can't stand each other!) so I don't even have a group of friends.
So far I can only think of a hot desk situation.
I've posted on local groups but have never had much joy. I've been to classes too, and I DID meet my DH that way but never made any friends!