Can someone please help me?

My mother died 6 months after I was born from cancer. My dad relates the two and blames me for my mother's death. I am 15 now, and he constantly bombards me with anger. Although he never tells me that he relates me to her death, my aunt says I am like my mother, which makes my dad more angry. How do I respond to this? How do I pull myself up from thinking that I killed my mother? How do I get through to my dad that what he does to me tears me apart? PLEASE HELP ME!