It really isnt like its portrayed in the movies or shows, and thinking back I remember a lot of people complaining about their own roommates often. I definitely have some horror stories like the dorm mate who throw up on the floor while I was out of town and left it there. She was absolutely gross. I eventually got a staff infection living with her for which I still have a scar and on my face too.
With Others, clothes borrowed with out asking and sometimes ruined. Food disappearing, (young me also guilty of that roomie no no here and there), jewelry borrowed and lost, difference in cleaning expectations, and I swear I am laid back, relatively clean and even young self centered me was not really high maintenance or ocd about it. A few came onto my boyfriends, one had guys over after bar closed quite a bit, another played David Bowie non stop, from early morning to late at night, and lol I wasnt a fan. Much, much more.
A few might have a great roommate and live together all through college, but I rarely saw that if ever. I think my brother had one he roomed with all 4 years.
Anyway, I dont think you missed out on anything but stress and unwanted frustration. Late teens and early 20 year olds often dont understand boundaries, I know I didnt. Lots of self centered ness in those days too and pure roommate drama lol. I was done with it forever by age 22. My hubby is the only one I can ever live with and eventually did after all that.
The last thing I will add is you know that saying about fish and company going bad after 3 days. Roommates have a longer timeline I guess, but the fish pops up here and there every time.