Congratulations on having fun in high school, that's all I can say.
As far as it being "unfair" to make someone wait...you have the rest of your life to be a sister of your sorority. Why push someone to do so before they're ready or penalize them if they decide on their own to wait...which unfortunately is what happens to most women who wait till sophomore year at UT, LSU etc etc etc. They find themselves "handicapped" because they are sophomores, and their choices limited.