Little rats?

Why is my sister trying to set me up with her middle school friends?!?! She invites me to go out with her to these places and I ask her which of her friends are coming and she says she doesn't know. I already know she's lying, because she is the worst liar, even though she is a LIAR. I see right through her. Is it normal to not want to go anywhere with her because she is a freaking set up.