I had an absolutely terrible time in my small underfunded high school due to chronic illness, family tragedy, coming from a poor home, and just generally not having that many friends. I got picked on, I struggled intensely with untreated ADHD and depression, and was just all together miserable.

But to spite all that, I completely understand what people mean when they say they miss that period of their life, and I'd never seek to make them think they're wrong for feeling that. There's a weird defensiveness about this topic where people seem to feel anyone else having any sort of positive association with that period of time somehow invalidates their own hardships.

High School is not a good or bad thing. It's just a thing. An experience that was different for everyone. It's okay to leave it at that.