at one of my interviews, a medical student at the school said something to me that i really appreciated because i know it is true. She said that she wished someone had told her not to take it all so seriously, and that it was not all about her. A med school is trying to create a balanced and fit class. That means they can't have a class of 100 gunners, but they also can't have a class of 100 social butterflies.
I know that this is true because if you ask a school why they don't have a ranked waitlist, they will give you this as one of the reasons; when they fill a "spot" that is vacated, they want to fill it with a similar student. And this is not just about stats, it can be about gender, race, and personality.
I think it is important to remember that these waitlists may or may not be about your stats, your ecs, your gender, or your interview. If you felt like they went well, then they probably did, and freaking yourself out by second guessing when mock interviews and such have all gone well is only going to drive you crazy.
It is october; this game is not over for until at least march, and i with the way waitlists work, i would be more inclined to say that it is not over until june. I think that being on a waitlist this early can be an ok place to be, and it is certainly better than a rejection.
Stay strong dude, this is a horrific marathon but you have 6 interviews so chin up and good luck!