A dare from your friends isn’t courage. Saying “nah, I’m good” usually is.

Being dared moves the decision out of your hands, which is roughly the opposite of nerve. Courage means wanting an outcome and accepting the risk attached to it, while a dare supplies only pressure and an audience, and the danger stays exactly as real as before. That it was someone else’s idea does not make the consequences someone else’s.

Ask whether you would still do it with nobody watching. If the honest answer is no, you already have your answer. Saying it out loud costs about ten seconds of noise and usually frees somebody else in the group too.