I hate my little sister with a passion. She's the devil, seriously! I don't associate with her because if you try to she like flips out. Anybody else dislike there younger sibiling with a passion?
I am sure lots of people do but you have to realize its an age thing. It will be different once she grows up. As much as you dislike her now, you have to realize that family is sacred. In your darkest of times, your family(and not your "friends" who come and go) will be the ones who are always there for you.
I feel the same way about my younger brother. At first I thought it was my fault because I never tried to be nice to him or hang out with him but it wasn't. I put the effort into it and he was just a prick. I fucking hate him.