Good question...
It's strange. I've always been more "grown up" and mature than my peers, but lately I've been feeling like I'm expected to be completely grown up and I just don't feel that way yet. I'm 23, which sounds old to me, yet I get no sympathy from older people who all say 23 is young.
I guess what's really prompting my confusion is the fact that a great deal of my friends and acquaintences are either in serious relationships or are already married. I feel this sort of generalized "pressure" to find a girl and settle down. But every fiber of my being says that I'm not ready for that. I went to Europe late last year and had an absolute blast. It was a total enlightenment for me and it made me want to go back and revisit everywhere I went and see the rest of the world. However, once you've got a wife and little rugrats crawling around, those desires take a serious back burner. Don't get me wrong, I do want a wife and kids, but I don't see those as being priorities at all. I've got so much more to do before being tied down by those things. But the fact that all my friends are tying the knot is causing me more than a little grief (like "if they're doing it so should I"

.
But I know that it will happen when the time is right. I'm single now though so there isn't much chance of it happening in the near future.
As far as other realms of being "grown up". I'm living on my own, working as a consultant, paying all my own bills, cooking my own meals, doing my own auto maintenance, etc. I'd say that those all qualify me as being "grown up". They all feel like second nature now, but it is kind of strange when I think that I'm surviving completely on my own.
I guess growing up is kind of a scary thing for me. I didn't have nearly enough fun as a kid so I'm not as ready as some to "give it all up" and become a boring old man who goes to bed at 10pm every night and whose idea of a good time is taking his wife out for dinner and a movie. No offense to all of you who do live that life, but I'm just not ready for that yet.
l2c
Edit: LOL Optimus, I typed that message before seeing yours! I wasn't referring to your post at all. Sounds like you're very happy with where you are in your life. I'm jealous in a way!