Raising children of course. Having to try and explain adult things to kids, and not really knowing what to do/say when they run into trouble with other kids.

I didn't grow up doing a ton of outside stuff, or really being around a lot of manual labor. So things like fixing my own car, remodeling my house, or building something makes me feel all adulty. For me, loading up a trailer and taking stuff some where makes me feel pretty grown up.