It sounds like you've done a great job of working through some really challenging issues. The biggest thing sophomores have in their favor is knowing members in the houses already. I understand that you haven't exactly been a social butterfly this year but maybe you can take this opportunity to really try to meet some women. No stalking but authentic friendly communication and heartfelt questions can go a long way. Also, without vomiting out every problem you've ever had, you can approach a girl or two in your classes that hopefully you know at least a little and say you are interested in Greek life, you haven't been very social this year but you're really hoping to change that and any advice they can give would be appreciated.
Also, study groups can be a great way to get to know people in your classes. If you've gotten good grades in your classes there may be some girls who would love to pick your brain. But in any case, try to work on just saying hi, loud enough that you can be heard, to people you encounter. Those little encounters can really help your confidence too.
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"Traveling - It leaves you speechless, then turns you into a storyteller. ~ Ibn Battuta
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