I think this summer was a lot of what everybody else has been describing. The main way you can see it is in all the new clothes I've been buying. Instead of buying baggy jeans and GUSTER tees or whatnot, I'm buying skirts and blouses...it's like I could go out there and be a teacher already, just based on my wardrobe.
Also all those times when I make a decision and then think to myself, "Wait, that was the *responsible* thing to do!" (For example, I was going to take on a job at KFC, and then decided not to because I realized that I needed to have enough time for classes.)
Drat this whole growing up thing!!!