It is not "introversion". I remember when I had friends when I was little and it was great and I wish it had continued into my teens and adulthood. I play both solo and multiplayer games and while some solo games absorb me for hours, human interaction is much more interesting. If people just treated me like a normal person like everyone else, as I often find anonymously over the internet, then I would socialize more.

The problem is society has changed since say the 1950s where you where every boy was born and raised to be part of the community and included to a much greater extent. 99% of the girls are socially accepted but only maybe 80% of the boys nowadays. It is considered socially acceptable to brand a boy a "twat" or something like that and permanently exclude them, teachers help ostracize students and even parents contribute to ostracizing their own sons. Girls are bullied too, but never permanently excluded in the same way, Stacy will make fun of her hairpin, but she won't be considered a threat or an inherently bad person, not like a weird socially awkward boy, she will still have a chance to be part of society while the boy is cut out entirely.

It doesn't help that boys are rebellious, so as teenagers we would rebel against society, they'd mistreat us, we'd fight back, then they'd tell everyone "look he's a bad person". This is all planned out, they run circles around us. Media, "feminists" and all different groups actively decide "right, some boys do not conform, they make the girls go ew, we don't want to waste time or resources on them, we will brand them inferior subhumans and get rid of them", they dress it up in their language, like saying "oh it's toxic masculinity" or some other "gatekeep" "gaslight" sociopathic shit, but really it is hate. They just hate you, and want you gone, and are going to make sure you never have a chance, and they succeed easily. It is the permanence of this hate that does it for them. They are the real "hate group".