They'll know. You don't need to bring it up. I would spend some quality time thinking about why rush didn't go well for you. Were you memorable but only in a bad way? Did you not hold up your end of the conversation? Was your appearance up to snuff? You don't have to be a beauty queen, but you do have to present yourself well.
What sororities don't want is the weird girl who only wants to talk about her pet turtle or the girl who won't talk at all or the girl who completely dominates a conversation. They want a girl who can grow and be part of a group of friends. You want them to know that you are a loving friendly SMART girl who is also not too big for her britches, so to speak. After you've spent some time thinking about what you might have done, talk to someone you trust and accept their advice. It CAN happen that you just fall through the cracks, being for instance number 41 on everyone's list when 40 was the cut off. But probably not. If you fell too low on EVERYONE's list, something was probably wrong. If you don't change anything about yourself there's no reason to expect a different outcome. That's not to say you should act like a different person, but maybe a kinder, gentler version of you. You but with manners, for instance.
Work on your conversation skills, your wardrobe, your makeup and your general manners.
Let us know how it goes!
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"Traveling - It leaves you speechless, then turns you into a storyteller. ~ Ibn Battuta
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