Casey, while you may be the youngest person onboard, you seem to have a very adventerous spirit that may well appeal to your fellow travelers. Bet plenty of them would love to talk with you about places they have been, etc. I also doubt your parents would spend the very big $$$ on a trip like this if they thought you would be bored and miserable. Think of this as an opportunity of a lifetime in many, many ways.
Have a BLAST!!!!!!!!! Wish I could go too!