For your four (or five or six, depending on who you are...) years of college, all you ever hear is, "These are the best years of your life! It's downhill from here!" Of course I loved college, and my four years in Athens were incredible. I had a blast, met so many wonderful people and got a great education to prepare me for where I am now. However, I truly dreaded the responsibilities of adult life because that's what I was supposed to do. Its ingrained in your head as a college student that this is the only time you'll have true freedom, and you should want to stay a college student forever.
I have to admit, being a college graduate isn't so bad. I'm living in a great city that I fall more and more in love with every day, I'm enjoying my internship and I'm meeting interesting new people everywhere I turn. I even kind of enjoy the "adult" responsibilities of going to bed early on weeknights and keeping up with paying my own bills because it gives me a sense of accomplishment. Sure, I still go out with my friends and have fun on the weekends but I'm easily settling into a routine and loving it.
Last summer, I remember one of my co-workers telling me that she actually had more fun in her first few years out of college than she did in college. I laughed at this silly statement at the time, but I'm actually starting to understand what she's talking about.