A couple of weeks ago, this video caught my eye on LinkedIn.
The maker explains how he knows lots of people, but has none he would consider a friend. This is sad, but not untypical, especially for men.
However, I think this is where model railways and boats can help. If you embrace, at least partly, the social side of joining a club, then you get to skip the end of this film where he goes off to what I suspect is an awkward session in a pub with people trying to come together to force a friendship.
Instead, a hobby gives you common ground. You have something to talk about. Yes, there are idiots that will bore the arse off you, and it's worse in a hobby home to many on the autistic spectrum and lacking in social skills, but that's life. Move on and talk to someone else.
I'm a massive fan of clubs. Joining one at 14 helped a very shy kid come out of his shell a bit. I'm a long way from gregarious (although I can pretend sometimes) but it helps. Maybe I know very few I could call at 2am with a problem, but at least I know that once a week I can go (to quote the opening of Cheers) somewhere where they know my name and sometimes even pretend I am interesting.
So, if you are feeling isolated, find your local club. Accept you'll need to muck in a bit and the members are not there to entertain you and you'll be fine. No skills are necessary - if someone is cutting a piece of wood, the person they like most will grab the other end to help. You don't need to be an expert to do this!