Old High School Classmates

I saw an old classmate from high school at Kroger today. Or rather, he saw me. I’m not the type of person to actually look at faces. Rather I try to avoid visual contact with strangers. I don’t know why. I think it started in college. I would avoid eye contact with people in trying to avoid having a conversation with them. Introverts are like that.
This is the 2nd time within a couple of years where someone has noticed me and I didn’t necessarily recognize them. I guess I haven’t changed much physically since high school. I’ve gained a little weight (upto 140 lbs according to my last doctor’s visit) and wearing glasses now.
Anyways the conversion with the classmate was the obligatory “I know you. Yeah, what’s you’re name? What are you doing now?” That was it. Which is how most people converse with acquaintances from high school. It’s not that we dislike each other. It’s just there’s not much to talk about.