Crush (2004)

In a world of subtle horrors, Elizabeth Mason is about to meet one monster she never counted on - herself. On the day of her 18th birthday Liz undergoes a strange metamorphosis which, for reasons unknown, causes her to transform into the monster called Crush! As if growing up isn't hard enough without that, Liz soon has to deal with a deadly, ruthless agent tailing her... with teenage werewolves. At least she has her best friend, Jen Tanaka, to count on. And what at first seems to be a curse may be the very thing that leads her to understand who she truly is.