Yeah. 18-20 was absolutely miserable for me. My arrogant ass chose to go directly bro industry (good decision, bad reasons) and I spent those years absolutely isolated. Social venues for people that age not geared towards university populations feel non existent.
When I tired 21 the situation improved a bit, but I still feel the lasting effects of that early isolation. Oddly I still don’t meet people are my age group. I go out and I see all sorts of people from teenagers to people well into their 80s-90s but almost never find myself in a conversation with a peer. Most of my current social group is with people who have 5-10 years in me. It’s particularly interesting as since I’ve been five years old, I’ve always made friends with “older kids” with about that gap.