When I realized I was a grown-up

(I'm CCol4him2 on There.com)

I think the first time I realized I was an adult is when I was babysitting an infant out of town and I could not get the infant to stop crying. I tried everything-and I called home., but it didn't really help except to have a sympathetic ear. It was the first time I had to solve a problem without my parents stepping in to solve it. I was alone and scared, but I and the child survived.What about you? When did you first realize you were a grown-up?