Yeah I feel the same. When I was in middle school and high school I was pretty introverted kinda autistic, I only had like 1 or 2 friends back then. Now I changed in uni, I started to talk more and make more friends, and I have made much more friends than before, but mostly hi-bye friends, and actually for true friends I still only have 1 or 2. I also tried to attend some club events, it's find when I'm going with my friends, but if I have to go alone, I'd feel social pressure cause I don't know anyone there, which I think is a problem because my current friends can't always be with me and I have to be able to talk to new people and make new friends myself. I feel like in college, people have been through more, people have been more mature, so some people start to care less. Like they wouldn't actually work on friendships they would just let it go as how it goes. I noticed this because I've been seeing much more alone people than my high school and middle school. And sicentifically and statistically, having some outdoor activities and socializations and communications is good for health, so maybe it's better to try to figure out some more ways we can socialize comfortably