Firstly I would say, tell your mum and dad exactly how you are feeling. Do not worry about upsetting them. As a parent, I would be more upset if my children did not tell me how they feel than I would be if they told me they did not want to come.
Secondly what Laura needs is some of you young ones replying to her to tell of your experiences, good and bad! Or are you just too busy partying?
Best of luck