Dear Lindsey -
You are NOT shy. You are DEEP and MYSTERIOUS.
You are NOT plain - you have CLASSIC GOOD LOOKS or are FRESH-SCRUBBED (whichever you like better).
You are NOT quiet. You FULLY EVALUATE THE SITUATION BEFORE GIVING YOUR OPINION.
Believe me, I know what it's like to get treated like crap to the nth power - and even though I rushed as a sophomore and knew people already, I definitely had some worries about how it would affect me when I got cut from groups (which I knew I would) because I was afraid it would freak me out and give me junior high flashbacks, but it all worked out OK.
If nothing else, you'll meet a lot of people and get practice at that - good luck!