You don’t need anyone’s approval to leave a situation that feels wrong.

You are allowed to go before you can explain why. The urge to have a reason ready, one that would hold up if somebody challenged it, is what keeps people sitting in rooms they already wanted out of. Discomfort is not a case you have to argue. It is enough on its own to get you moving toward the door.

Work out the exit ahead of time: who you would text, how you would get home, what you would say if anyone asks. A mapped exit is much easier to use. And if you leave with no explanation at all, that is fine, and words can come later.