You were a werewolf. Even if it was weird, you used to live amongst humans and feed from time to time on one of them.

Guilt filled you anytime you ate a human, but if you didn't, you would die.

Vampires existed too, and hey we're most likely the one that directly made werewolf's lives harder by stealing their food.

The two sides were enemies, humans were the common prey. And rarely, most of the werewolf population was gone or hidden in caves. 