If you're an extrovert, do you have trouble writing extroverts? If you're an introvert do you have trouble writing extroverts?
How about writing about social anxiety and shyness?
I don't think I really struggle writing introverts, despite not being one because one of my closest friends is an introvert, and he tells me constantly about how many things burn him out, and those get mixed into my characters.
In the spectrum of shy characters, I think a lot of people find characters that are shy or passive annoying, but I personally think they can have as much depth as independent 'assertive' characters, and it's just when we make shy a synonym for helpless that the characters seem redundant.
My female lead in "Damsel in the Red Dress" and my male lead in "Hushabye Prince" are both rather shy, quiet people, but they deal with these things extremely differently.
Despite Alicia's severe shyness and social anxiety, she pushes through it to still pursue her dream, doing speeches, interviews, and interacting with strangers. But it's something she had to work through and stop allowing to handicap her life.
Jinwoo never talks to strangers, but his shyness comes from his wariness of scaring other people, and as he gets more comfortable, he comes out of his shell. He not that passive, but does avoid expressing himself sometimes to try to avoid trouble. I's not because he has no opinions or interests, he just tends to express them with people he trusts rather than strangers.
That said, neither one of them are passive enough to tolerate people doing things to them without complaint or resistance, and that is an important boundary line.
Alicia didn't have this at one point but she has it now. Jinwoo has always had it, though he's rarely needed to exercise it since, despite being quiet and generally chill, he usually gets his own way.