Is it normal that i'm scared of my little sister, i'm 18
So, my little sister attacks me sometimes and it's brutal. I have bruises all over, some days. Other times she attacks my parents; when they're in their room, she bangs on the door and cry's loudly. It's insane. She clawed at the door with scissors in an obvious effort to kill me one day when I decided to lock myself away from her abuse. She is 6 and, my hand to god, if I stop her from doing anything, my mom beats me. Is it normal for me to be terrified of her?