I don't have friends, but I'm quite happy with that.
I'm friendly with work colleagues, but don't see them outside work and know that their friendship is purely circumstantial. If they or I were to leave, we wouldn't keep in contact.
I socialise with the wives and partners of my husbands friends but they aren't my friends. If we separated, I'd never see any of them again. Same goes for his family - we get on well, and I'm friendly with his sisters, but if things went south we wouldnt keep in touch.
I don't use facebook which feels like the biggest barrier to keeping in touch with old schools friends. Plus I moved away from the area I grew up in, so never bump in to anyone I know.
I have friendly conversations with a couple of the mums I see at school pick up, and my son's best friend's mum is quite nice, but we aren't friends.
The only people I actively socialise with are my family; parents and sister. And they live far away, so it's mostly via our whatsapp group.
I'm aware I'm very introverted. I used to feel sad that I didn't have a group of friends, but I don't anymore. My capacity for social interaction can just about cope keeping up with family and the various acquaintances I see day to day. I doubt I'd make a very good friend. I just like my own company.