This is a great question but I would say it varies for everyone.
Personally, I put a lot into my years (now in final year) both academic and in other ways so I have so far gotten a lot out of it. I believe you put in what you get with university. I initially found making friends very daunting but quickly learned that other people want to make friends as much as I do.
It might be helpful to read blogs or watch videos of alumni stories/current students. These can usually be found on YouTube.