In order to start a new NPC group at IU (not sure which IU this is, assuming Illinois or Indiana, didn't check which one had 18 NPCs), the campus would need to be opened for expansion.
In order for the campus to open for expansion, the Panhellenic council there would have to vote to open for expansion.
So the choice to start a new NPC group at IU is not really in your hands.
You COULD start a local sorority or interest group. This is an extremely difficult process however, and especially at a large school there will be many hurdles in order for you to grow numbers and gain campus recognition. Read this thread before you start down that path:
http://www.greekchat.com/gcforums/sh...ad.php?t=93174
If you are truly interested in joining an NPC and there are any groups under total at IU, I would recommend that you consider continuous open recruitment with them if it is available. That is probably your best chance to join an NPC. I don't know why you feel you didn't fit with any of the chapters, but if it happens that you feel that one or several of them are "beneath" you, you're probably wrong. On the other hand, if you just failed to match in formal recruitment, maybe you could give some other orgs a chance. Or otherwise, just realize that you may not be able to be a member of the NPC.