Just quit. You are too negative to give this a chance to succeed.

You know, when I was a pledge (back when dinosaurs ruled the world), I can remember being so shy at the beginning. I would never go up to the suite to hang out unless another pledge was with me because I was scared of being forward. Looking back, that was silly of me! My sisters gave me a bid because they saw something they liked in me and wanted to get to know me better; same reason your sisters gave YOU a bid. One week is not enough time to see if you are a good fit; give it some more time and make an effort to get to know the girls. Good luck!