Should I rush?

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I am a freshman at a decent-sized state university, and am considering rushing at the beginning of my sophomore year. What do I want to benefit from a sorority? Really good girl friends (I don't have many), great connections for the rest of my life, somewhere on campus I can call home, and the opportunity to meet a lot of really great people (I'm fairly shy). But as I observe the sorority girls from afar, they all seem somewhat stereotypical to me... Party non-stop, hate on other sororities, and are really judgmental. Granted, those are just the girls I've noticed at my school alone, but I'm worried 1) If I join I'll end up like them, which is totally not me. I'm really really laid back, free spirited, you know. And 2) that I'll put a lot of work into trying to impress houses for a week, only to be cut and not get asked back ANYWHERE. I have to admit, I'm a bigger girl (size 16, but I don't think I'm super-obese or ugly... I have a decent self-esteem level), but I've heard that sororities will cut people based on their size and their attractiveness to the fraternities. Which honestly, I don't even want to be apart of something like that.

I guess I'm still weighing my pros and cons, but was looking for advice or support thoughts. I have done some research on the sororities at my school, and my top 3 are Sigma Kappa, Alpha Gamma Delta, and Kappa Delta, though if I rush I will for sure keep an open mind. Thanks for your help!!!