I'm in a similar situation as bobbleballbags. I went through a difficult time in my life and any remaining friends I had, I distanced myself from. I do miss them now, but it was the right thing to do at the time. They weren't putting much effort into the friendship either so I didn't push them away, I just stopped contacting them first and since they never contacted me that was that.
I've made peace with it by accepting people will come into my life or they won't and also most people don't stay in your life forever anyway.
I don't seem to have a lot in common with most people and I'm not willing to spend most of my free time doing things that make me feel awful and drained, just to keep a friendship going. It doesn't feel worth it. So I only do activities that I actually want to do these days. I used to put so much effort into people who it turned out were ultimately not bothered about the friendship fading away that I CBA to do that any more.
I don't really want deep friendships either. I find a lot of what is dressed up as true deep friendship to be toxic, people only leaning on you when they want to complain about their lives, but never having much time for you when things are going well and never checking in if they don't hear from you in a long time, to see if you're ok. I seem to attract people like that unfortunately. Or maybe most people are like that, IDK.
I just want to chat and have fun. If I confide anything negative to someone, which is rare, it's like a one minute moan then I'll stop going on about it. So I don't really want people confiding all kinds of problems to me, it makes me sad and the friendship one-sided.
I've got one friend who lives on my street, my DP, I chat to a few of his friends if they're around (some of them I don't like at all, so stop at hello!). I occasionally chat with some family members too, but it's not often or for long. That's down to circumstances. The ones I'd like to meet for coffee live too far away so I barely ever see them. Some are difficult people I can't spend too much time with without feeling like I'm going mad and the rest aren't interested in being in touch other than at big family events. Luckily I'm happy in my own company! I'd be very lonely otherwise.
Society has changed. Most people's main lives seem to be online now and real life friends is something many don't have time for. I mean, they have the time, but they'd rather spend it online than meeting up IRL. I'm wondering if, in 20-40 years time, society as we know it will have disintegrated completely.