Two days ago, on May 20, 2001, I graduated from Carnegie Mellon University, with a bachelor's degree in computer science. (On an amusing side node, my roommate was somewhat miffed by the title of her degree and was considering petitioning for a spinster's degree).
I'm going to graduate school in the fall, still at CMU, so it's not like I'm making a big change or anything, but this still feels like a fairly major step. In less than 20 days, I will be 21 years old, and I have a college degree. ...an adult by anyone's definition...
And yet, I don't really feel any differently than I did when I graduated from high school.
Right after the graduation, the dean of my college congratulated me and said "Well, now you're a real person.". Maybe that will take a little while to get used to.