I'm so sorry for my sister,I don't know why did I do that,It

I'm so sorry for my sister,I don't know why did I do that,It's so late to say sorry,I'm not a good-temper girl.How can we forget it?I always do that,I hate myself very much .oh god ,tell me ,what can I do?I want to be a good people,but I can't control my felling,it's too bad.My friends was not happy to together with me,who can help me?
帮我看看有没有问题.