First of all, congrats! :) You did great, don't keep second guessing yourself. I used to struggle at horse shows because I would watch others getting the blue ribbons; the key is to treat it like a learning experience, enjoy it, and let it roll off your back.
Also, I've had classes that must have been judged by someone on drugs xD I mean, there's been times that me or my friends have gotten places that were totally wrong--and our instructors and other people came up to us and told us that there must be favouritism going on because we did way differently than we were judged o_O It depends on the judge. Don't let it get to you ;)
It's a dangerous business, Frodo, going out of your door," he used to say. "You step into the Road, and if you don't keep your feet, there is no telling where you might be swept off to."