I'm going to ruin a vacation
Why you want to ruin vacation?
I can't help but think the vacation is wasted on them
You should calm down and not try to ruin a vacation for others. If you have issues you can seek mental help to try and get to the bottom of it.
Why do I have to calm down and why should I see a therapist? I'm not the one with a problem.
You'll be the one causing problems if you insist on ruining other people's vacations. Have you considered how much time and effort they spent into planning their vacation? Wouldn't you be made if someone ruined your vacation?