My sister nvr treats me with respect.. What do i do now?

The point is, it may never change. And you can not let that stop your growth. You must always show her the greater side of yourself and not enter into conflicts with her. It maybe painful as she treats you in the manners as she does, but you must keep growing and maybe she will one day see how foolish her behavior is. You may tell her once how you feel, after that she always knows what she is doing, that why I said you have to keep growing and ignore that part of her relationship with you.