Depledging A Fraternity

I am currently pledging a fraternity at my school, but I've decided that it is a really bad fit for me. I've tried to stick out the process, but the longer I'm in it, the more it seems like I just don't belong with this group of guys. Who should I contact in order to get more information about the depledging process at my school? And once I do depledge, am I blackballed from other fraternities on campus or would I be able to rush somewhere during the next year if I find somewhere that I fit better?