Hi,
I am a VERRRY shy person and I am the organizer and founder of my sorority. I still have that shy streak but what I would advice you to do is to just go for it. You know you're a great girl, you know you have a great personality, let people know it. Like cherrycola said, start small talk at the grocery store or wiht the people that sit around you in class-start out small with a question like if they understod what the teacher was teaching or get together a study group. One big thing you could do is offer to be an ambassador, like giving tours of your campus and stuff like that. This way, you are pretty much forced to interact with people. Thats what I did.
I wish you all the good luck and remember-just go fer it!