It can be tough to see people for who they really are when you're on the outside and looking in. Give these girls a second chance. You sound like you're open to new experiences so definitely go through Fall rush and hopefully you'll find an organization that best suits your needs.
It's true that I no longer have time to hang out with all my non-affiliated friends as much as I used to.. I'd imagine if I had pledged a fraternity instead of helping found one it would have been even worse
Best of luck though!
LHT
Kevin
MT 5
University of Central Oklahoma