It's true, only people who did well and are proud/pumped/excited are going to post their scores. I did well, and I did post my score. If I hadn't done well, I probably would not have.
Seriously, even though I did well, I feel more and more like the MCAT is only a small part of someone's application. I have a high MCAT... but I don't feel any different, the things that make me want to be a physician haven't changed, the person that I am hasn't changed, my life experience is the same, and my motivation is the same as before. The only difference now is this number attached to my application.
So don't fret. It was posted before, but it bears repeating. You know what the averages are, so keep them in mind.
Best of luck,
S