I think some of us are just good at turning acquaintances into friends and others aren't.
I moved around a lot as a child (DF was in the army) and became very good at going to a new school, new neighbourhood and being superficially sociable, but it never went further because we were always moving on to the next posting so I never acquired the skill of turning an acquaintance into a friend
I do have friends, including some dating back to school and university, but I think they were the ones who befriended me and I responded.
I think people fall into one of two groups, those good at building up social circle, like my DS & DDiL, who seem to know half the population of the town they live in and have a stream of close friends who they visit and who visit them. DD is quite the opposite. She has chosen to live alone, now works from home. Has a small group of close friends she is constantly in touch with, mainly online, and sees no need to be more social.