I totally understand how you feel. I was really nervous about moving into the house at first. Yes, there will be drama and yes your sister's will probably get on your nerves. Just keep a cool head and try to stay out of the drama and any situations that might throw you into it with out you realizing it. Also, keep an eye on your stuff. When you're living with a lot of other people sometimes things get mixed up. Despite all the crud that comes with it living in the house is sooo much fun!
and well worth any of the frustration. You'll get closer to the sisters you're living with. Good luck with living in the house and recruitment it's so fun.