Remember to keep an open mind and enjoy yourself. Three houses is great to choose from, and keep in mind that in most cases, you can be happy wherever you make your mind up to be happy. All sororities offer the same basic things in membership although there are some differences in approach, policies, etc.
Just keep that open mind, have fun, ask questions, show interest, and be yourself. We have all been there, I was cut heavily at the beginning of my rush because I rushed as a junior, and we know how it feels. We love you - keep your chin up and smile.