“I haven’t kept in touch with anyone from school or any former job.”
I went to a high school reunion last year - it felt like a reunion of strangers.
I could have gone to a movie theater and felt the same level of closeness with the crowd there.
That makes me glad I skipped my high school's 50-year reunion last September. I haven't seen anyone from there in maybe 45 years, and I never went to any of the other reunions, but I'll admit I was a bit curious about what had happened to a few people. Still, it would have been a 1300-mile drive to get there, and I wasn't that curious.
One of my brothers still keeps in touch with several high-school friends.
I found that after the initial - Hi! bla bla bla - the people I disliked then, I still disliked. Nothing changed.