If I were you, I wouldn't worry too much about why everyone else is at a party or parties. Everyone else won't be making the decision that's right for you. At the very least, I say if you get the invitations, stick it out til Pref. Maybe Doug sees something right now that you don't. At any rate, I would say it's not something to worry about until you see the invitations, anyway.
Like I said, though, I would at least stay with it until after Pref. I was cut from ALL sororities on my campus during recruitment during the FIRST round of invites. I would've been happy at any of the chapters, so I don't understand people who get invitations and drop out, anyway, at least without giving all the chapters a fair shake. Luckily, I found my home, and with any luck, you will, too!