I tried to trick them but it didn't work out:
The next day, the other campers find your headless body floating in Lake Werewolf. They know it's you because your nametag reading, "Hi, I'm Werewolf" is still stuck to your shirt.
The lore behind this (which I definitely thought about ahead of time) is that the werewolves primarily rely on their sense of smell to identify their prey. So not only can they tell that you're not a werewolf, it also only enrages them more that you thought you could fool them with such an obvious ruse.
So just imagine that your head got ripped off extra-hard on that one!