what does “adult” even mean?

My 18th birthday was two days ago (the 27th), and what do I do with my first day as an adult? Hit a car. Bahh; that’s what I get for being in a hurry - and backing up without looking.

But moving on from that… I’ve been doing lots of thinking about what it means to be an adult and (especially in light of graduation) to make your life your own. It’s a crazy thought. Am I responsible enough to be an adult? Well, considering yesterday’s incident, I wouldn’t say so. Am I old enough to be an adult? Technically. But really; what’s the difference between being 17 years and 334 days old and being 18 years old? I just don’t understand the whole “coming of age” thing I guess.