You were an animal (the animal you like) that, like Chopper, had eaten a devil fruit (the one you like too). So after that you still had the instincts of your animal. So You were forced to leave your village, because they offered a reward of 10k berries for you. One day you went on a boat to steal when you woke up you heard something

Nami: Look! They offer 10k of berries! Luffy: Hmm? Look Chopper looks like you! Chopper: he is very surprised Zoro: sleeping Usopp: Woah.. Robin: cute.