I missed HS when I was in my first few yrs at uni, as do most people I think. Most people don't have as close a group with their uni friends than with their HS friends, since not everyone takes the same subjects, people skip classes, etc, whereas in HS you're with your friends every recess/lunch.
Looking back, they were fun times. We were naive, and blissfully ignorant, enjoying life without worries. But hey, you'll grow up and mature, and while its nice to look in the rear-view mirror and reminisce on the past, you'll grow past it and move forward.