Grad student but mostly all of the hot girls at the university are in undergrad and in sororities. Any advice or am I in a very rough situation?

So I will be starting grad school at the university in my town this coming fall and I've been invited to the facebook group for my grad program. Joined a couple days ago and there is an even distribution of guys and girls, except, there is a catch. The girls in my grad program, they're very plain, I mean 5s and 6s. Mostly Asian immigrants, a couple of white girls, and that is pretty much it.

The university I go to has a lot of hot girls in it but they are all in undergrad and most of them are in sororities as well. Problem is, I've heard so many things about how loyal sorority girls are to the Greek Life scene and how most of them prefer frat boys or college athletes.

I am in my mid 20s and I do think that someone like me trying to break into the Greek scene (they don't allow grad students to rush) is going to have a rough time. So any advice?