introvert/extrovert is a stupid dichotomy
there's a guy I've known for 15 years who doesn't talk much and has never expressed a single opinion on anything that isn't a video game, and even then very rarely. and I'm probably his best friend. but otherwise a completely normal guy.
another who literally cannot speak in public, will just nod and laugh nervously at questions, and can barely function when being introduced to someone new. but then is a completely open book the second it's just the two of you, will talk and talk and readily cry
they're almost opposites. which one is an introvert?