bully

i understand when you have a bully, you should go to someone. but what if your bully is your own family? your own sister? what if your parents have to keep telling you not to "take things to heart" because they have a responsibility to both of you? what if you feel like you could never fully explain to anybody, the hurt you feel? because how could you think your sister bullies you? what if your sister never gives it up even if you've tried many times to talk?