OP was nice enough to answer a pretty intimate question.

    You’re just insular

We don't know this person personally, so it would be wrong to make assumptions about their communication.

    you’re not really any smarter

You are using their innocuous comment, to project your insecurity onto OP. Well done on proving their point. Yeah, some people are better at tasks that are traditionally considered to signify intelligence. The kind who go to study difficult majors at university at 13, are very very likely to be smarter within that definition than the majority of the people they run into. It is fine to accept that. It is not like OP is going around taping 'stupid signs' on people's foreheads.

> it speaks more to your own limits than the limits of others.

Indeed, and that is totally okay for a 13 year old to have limits. You can't expect a kid to have any real maturity. People only really get good at communicating with age, and even then it is hard.

You're absolutely right -- as a 13 year old I was quite limited. I was mature enough to carry a conversation with 20 year olds, but not mature enough to carry a conversation with a 13 year old. (I like to think that I've grown up since; and while I don't talk to teenagers very often, when the situation arises I do manage better now than I did back then.)

This is exactly my point, and why University was a far better social experience for me than high school.