I think that you should tell them the truth, because if you know that you wouldn't enjoy those holidays with them, the best you can do is to explain them why. I think that you should give them some reasons, but also, if your parents seem very excited, I would do something with them, maybe not going on a holiday, but doing something else, like spending time with them at home or just doing exercise or other activity with them. I hope that they understand and respect your decision and that you can have some fun with your friends. Good luck!
I think that you should tell them the truth, because if you know that you wouldn't enjoy those holidays with them, the best you can do is to explain them why. I think that you should give them some reasons, but also, if your parents seem very excited, I would do something with them, maybe not going on a holiday, but doing something else, like spending time with them at home or just doing exercise or other activity with them. I hope that they understand and respect your decision and that you can have some fun with your friends. Good luck!