Ever since I was young my sister hates me. She calls me fat and she curses me all the time. She yells at me all the time. I have considered cutting myself many times, sometimes standing in front of our knife drawer. I can't take it any longer. I do nice things for her and sacrifice so much for her to show her that I love her, but she still hates me. What can I do to get her to love me? She is awful to my mother too. I really need help.