There was this girl, I'm surprised I forgot her name she was a sophmore when I was a freshmen. She went to formal rush, she didn't get a bid from the sorority she wanted. So she tried the next time around *The time I went* and, again, she didn't get a bid from the sorority she wanted *My sorority* Third times a charm. She came back after I got initiated, and we didn't give her a bid again. The reason? She tried too hard.
The first time around she acted like herself, but we didn't feel she fit in with us *can't blame her* the second time she went in with a different head on her shoulders and was more easy going. She didn't get a bid again, because my sisters didn't think she could handle pledging. The third time came around and she didn't get a bid because she wasn't herself. She was a different person all together, and acted like the girl that she "thought" we wanted.
The moral of the story? Be yourself. Don't kiss up to any sisters of the sorority you want to be in. Down the line, the real you is going to show through and they don't want a sister that is fake. Just be yourself, smile, and have a good time. I was petrified that I wasn't going to get a bid. It doesn't always work out for everybody. So, just pick the sorority/fraternity you feel at home with and the sisters that you could really get along with.
Believe me, chances are the sisters are feeling the same way you do.
Good luck!