history: I was really mean to my sister as a child, and I still feel bad about it. She's sensitive and I know it probably still bothers her. As a child_comma_ I was mean to my sister all the time and I still feel awful about it. Aw_comma_ well when your younger you don't do those things on purpose. I think everyone is mean to their siblings every now and then.
current: True, but she's very sensitive. I'm sure it still bothers her. I try to make up for it today, but I never can take those things back.
next: Have you talked to her about it? Maybe she doesn't really think about it anymore.