Do it. You'll regret if you don't.
And, if you loved being super involved in high school, why
wouldn't you want to be in a sorority? You have tons of people focusing on academics (Greek women consistently get higher GPAs than non-Greeks), philanthropy, and other activities who also happen to share that tight bond of sisterhood.
I'm sure you'll find other women there with the same "nerdy" major as you. When I went through formal rush, I almost wrote off ABC sorority because they had the reputation of being just pretty girls. The girl who rushed me had a Medical Microbiology and Immunology major, too. (She actually got me my first lab job.)
So, do it! I hope you love every minute of it.... I'm sure you will!
P.S. If you go through the entire formal rush with an open mind and you still don't feel you fit anywhere, check out the social and professional sororities (I'm slightly biased here
). You'll for sure have girls with the same majors and classes then. They also (as professional, too) focus more on careers in whatever field it is you're majoring in.