My sister is annoying sometimes and most of the time its at my tired, or already annoyed moments and it just makes it worse. I am turning 17 in July. How can I ask her to stop, or at least tell her that shes being annoying without hurting her feelings?
It sounds like the first step is to stop annoying her. At 7 she is old enough to start taking some responsibility, and it sounds like she feels that way too.
So when the stakes are low you should let her make her own mistakes. If she spills something over herself in the car, well that is her problem (and maybe your parent's problem if it gets on the seat). It is not your problem unless it goes over you too.