Hi

This is going to be hard, no matter how you put it, which words you choose, what sort of relationship you have with your parents. Sometimes it helps the other person - the one who potentially feels let down/ betrayed/ deserted etc- that we empathize with how they feel and that we are hurting too for being the cause of their hurt. Make them understand that it will be hard for you too to say Good bye and that it will break your heart a little,( or a lot ) but they brought you up to be independent and live your own life.
Good luck