"an opportunity to be in an organization that's like a sorority for adults (cheesy, I know). "
Not cheesy at all!!! The need for this kind of organization is very real, and the need has been met
Beta Sigma Phi is a non-collegiate sorority for women of all ages. Other fine sororities for "adults" have also been around for quite some time. In fact, Beta Sigma Phi celebrates 75 years of sisterhood this month
Good luck in finding a good fit.
Erica