What should I do in my 20s?

Hi! I have a pretty important question: "What should I do in my 20s? How to enjoy them?" I'm 22 years old and I feel like I didn't do anything in my 20s. Even at the university after classes I kinda just went home and watched some youtube/twitch ect. I haven't made any real friendships at university bc I just went home after classes. Right now I want to move out to the dormitory (in Cracow) for 2nd stage of my studies. I really hope to meet some people there and actually meet with them outside classes (I hope living in dormitory will help with that).

Tbh I am not even anti-social person, once a week I go play board games with other people (but I don't feel the need of meeting them outside of friday) Right now I also have a gap-year, so I pretty much stay at home 6/7 days of the week which starts being booooring :/

I have only 1 "Real" friend, which I treat more like a brother. He knows everything about me and I know everything about him, inclduing the most embarassing things, but we trust each-other. We have known each-other for 10 years and have been best-friends for almost 7 years. But I want to have more friends simmilar to this one.

I also have never had a real girlfriend, so I'm a virgin at the age of 22 and I feel kinda embarased about this :/ I considered going to the brothel, but I would not be able to look myself in the eyes after that and I also feel like it would not count. Should I just hook-up with 1st girl that wants it to get it over with? Should I first be in a relationship? Should i be actively looking for a girl to marry and later have kids with (in my 20s)?

What things should I do in my 20s, not to regret them? Are there some things you regret you didn't do?

Thanks in advance for all of the answers <3