Not sure if I'm ready

My therapist thinks I really need to start talking about my sister. I never do. Only the day she was killed. I rarely talk about her when she was alive because it hurts to much. But he feels it's is important for me to do this. I've pretty blocked out any good memories of her. I never think of them. I only think back to the that day! I just don't know if I can do this. He's not forcing me or anything it's just a recommendation that he thinks will help.