Problem

I've got some older friends ( I'm 13, they are 14/15) who have invited me to a party on saturday night at someones house. I'm pretty sure everyone there will be drinking, I've never had alcohol before I'm going to tell my parents I'm staying the night at my friends I'm quite nervous because I know it's bad what should I do. 

You should tell your friends you want to come and say your going to bring your own beer pre buy your beer and fill it with water while your friends are poisoning there body you will be drinking fresh water. its a much better solution than lying to your parents aswell