I am woefully unqualified to answer that question.
Same here. I read an article a few years ago that said that the part of the brain that controls friendship (in other words, any kind of human relationship that doesn't involve romantic love or s*x) peaks at about the age of 8; after that it becomes harder and harder to make friends or be open to someone wanting to be friends with you or even just getting along with people.
And since I pretty much wasn't taught sh*t during those important formative childhood years, that's my excuse and I'm sticking to it.
I read another article recently that said, "Oh, you want to make sure you have friends in your old age? Here's the only way: get in a time machine, go back in time to when you were a kid, preferably before about 8 years old, and if you didn't make friends the first time you were a kid, make sure to make them this time; and then never ever move away from that area and don't let any of your friends move either. And that's the only way you'll have friends in your old age."
You know I'm beginning to understand more and more why the psychiatric/psychologist/counselor profession has such problems with depression. The more we learn about the human brain, the more it seems to become clear that most humans aren't living at all in the best way for us to live: kids not being taught anything important (like how to even just get along with others, let alone be friends) in those important early years, everybody being moved around before they can even make friends. No wonder so many of us are depressed.
I read another article a few years ago about a guy who was the head bartender in a big fancy cocktail lounge in a big fancy hotel in New York City where they had a lot of conventions.
He said one of the groups that came every year was the American Psychiatric Assn. and every year he heard at least a couple of the participants say to another, "You know I'm really beginning to wish I hadn't gone into this line of work. I feel like they only way I could really help my poor patients is to tell them to get in a time machine and go back and choose better parents to be born to." And the other participant(s) would always agree. The bartender said he heard that every single year.
So depressing, I know but in some ways, learning all the above has taken some of my guilt away, realizing it's not all my fault; sorta taken some weight off my shoulders.