A couple things I wouldn't have expected are that I'm 24 and living at home with my parents. I was so glad to be out of their home when I went off to college, plus I loved the dorm atmosphere and made lots of new friends. At the time I turned 21, I was certain I would always be around my friends, living on my own or with roommates, and always just a hop and skip away from a party or a bar or some other kind of social setting. But then I graduated, got a job offer in the city nearest to my hometown, and didn't have enough saved to find an apartment on my own. So I ended up moving back home. Some parts of it have been nice, the not paying rent part especially, but it's my goal this year to move into my own place.
The other thing I'm shocked has happened to me is my relationship with my boyfriend. Five years ago, I had major commitment problems and believed very much in enjoying my freedom and taking time to understand myself without the burden of being with someone. But now, I'm so happy to be with one person and am so glad that he is who he is. It's been about a year and a half, and once in a while I get a little nostalgic for the time when I was single but overall, it's nice being in a commited and sane (most important) relationship.