why?

The same thing happened to me.

Stick with it!! Everyone has heart breaks throughout this process and there are times when it really sucks, but it only takes one sorority! Also, please give the ones you weren't that excited about a second chance- if you keep an open mind, they might surprise you this round.

On another note, very few houses ever do informal recruitment, so putting your eggs in that basket is pretty risky. There's a good possibility that the houses you didn't like during recruitment are the same ones participating in informal.

I'm so sorry you're feeling this way. Usually, the first round is when the most cuts are made. Even though you might have had a good conversation with a girl in a sorority, if she ultimately doesn't see you fitting in you'll get cut. If sororities kept every girl they had a good convo with, rush would be a year long. Give the other sororities a true, unbiased chance (because they saw something in you) and really observe how they interact with each other. A strong sisterhood is soooo much more important than anything else. Heartbreak is part of the process, unfortunately.

Also, don't bet on informal. Not every sorority does it, and if they do they are usually only looking for 1 or 2 girls. It's nothing like formal and you won't have a good chance at getting an informal bid unless you know people in the sorority.