I totally understand this is a tough decision, I been down that road. And really the only thing you can do as any other person would , is go where you feel comfortable and do what you want. As someone mentioned before don't let others intimidate you because you like one particular Org over another. Joining Greek life has nothing to do with race, although sadly to say some do think that. But it is year 2001 and people still think that way. Forget them, your choice and no one elses but yours!
I am in an MC org and I love every minute of it. I went where I felt comfortable and liked the concepts
So do what you feel as right~
~Wishing you the best of Luck~
DGPhoney~