The end of my teenage years

When did I become an adult? It seems to me that it snuck up on me pretty quickly. One day I'm yelling at my brother because he decapitated my favorite doll, and the next I'm at college, living on my own, and paying my own way. I remember when the only thing I had to worry about was whether or not we were having brussel sprouts for dinner. I'm not sad that I'm growing up... More nostalgic. I look at my younger brothers and sisters, and find myself wishing that they would take more time to grow up.
I'm still pretty excited about turning 20 though!