If you are being physically abused by your nineteen (19) year old sister where you are a minor, you need to consult with your school counselor about the situation as well as your physician immediately in order to obtain assistance to have this wrongful conduct stop assuming your parents have not intervened.You might consider consulting with an attorney about getting protective order as well against your sister. You have the right to be left alone and from what you have described out your sister who is an adult, what she is doing to you is wrong.You might also consider consulting with law enforcement about your sister's abuse with respect to you as well.Good luck.Â