[Alumiyum]

First, realize the rejection in recruitment is rarely personal (and by that I mean it's rarely because the actives do not like you). Though no one here can ever tell you why you were dropped, some common reasons include grades, being an upperclassman, falling through the cracks, or simply a competitive recruitment in which many, many personable and talented women do not get bids. More likely than not one or a combination of those reasons led to your being dropped. Rejection is a part of life, and this won't be the only time you'll face it.

You'll never know if you don't try. Think about it logically. Is it really the end of the world if you don't get a bid this time? I promise it's not. It will probably upset you, and that's reasonable, but it's not a reflection on you as a person. You can help yourself by having good grades, being active on campus, volunteering, showing genuine interest, and being friendly. Think about why you would be an asset to a sorority. What can you bring to the table? Let your Pi Chi friend know you're interested in joining and why. Put your best foot forward, and if for whatever reason you don't receive a bid, pick yourself up and find another group on campus that you can lend your talents and time to.

ETA: Be confident. Don't go into recruitment with a chip on your shoulder. As AOEforme says, that will show and it will hurt you.