I hit my younger sister ?

Yes it was wrong for treating her the way you did. She is several years younger than you and has a while until she reaches maturity. You are more mature than to hit her. Violence gets you nowhere. However, it isn't right for her to treat you the way she does. Maybe try talking to her and telling her how you feel and why she talks about you like that. It sounds like she's causing the problem, but you've got no right hitting her. There has to be a reason for her to act the way she does. Walk in her shoes. You should definitely apologize and tell her that she should try to be a better sister to you because you are a great big sister to her. Actually, if you aren't being nice to her, she may just be so upset with you that she has no other way of getting back. As for trying to quit being so pive aggressive, the best advice I can give you is to just walk away and listen to music and let things cool down before you try talking to her and explaining your justifications. It doesn't help very much because you are two very different people, but you have to learn how to get along with each other. Just try to be the best sister you can be and don't worry about the way she's treating you. She's being immature and you shouldn't stoop that low, stoop to the point where you hit her. Just talk to her and see her side of the situation and then you do the same.