We subscribe to the same packing ethos! (or lack thereof) :)

I'm sure you know that all this is perfectly normal - it would almost be strange if you weren't having these little doubts and concerns and worries about things you'll miss etc. There may be tears at the airport (for my siblings and I, whenever we went overseas it was a tearful goodbye), but once that plane takes off the feeling of embarking on a great adventure should hit you. And this IS a great adventure! You're doing something that most people in the world never will, and many would never dare to do. You've got a whole year of things to discover ahead of you, and it will be brilliant!