Are you? FYI, everyone who's accepted to med school feels this way. You're not smarter than your future classmates, bc your future classmates have the same qualifications as you. If their grades are lower, their MCAT's are higher OR their EC's and "personality" (LOR's, PS, and interviews) are better. Or vice versa. You're smart, but not smartER. In fact, in all likelihood, you're AS SMART as your future classmates.
As far as your PS goes, I had a great English TA my freshman year of college who taught me a lot about writing. Using complex phrases, long words, and obscure references MUST be well timed and appropriate. If not, they will only serve to obfuscate your audience. This will leave them feeling like you're either a) arrogant, or b) you sat down, wrote an essay, and hit "thesaurus" on MS Word for every word (in which case you just come off as dumb).
Calm down, getting rejected sucks. If you have the stats, you should be okay. Just take a look at your essay, review what seems confusing, arrogant, etc, and rewrite it. Let your passion for medicine shine through. Let them know that you genuinely want to be a doctor, and not just impress them with your big words. They'll no you're qualified by looking at your numbers. They'll know you care by reading your essay.
And please lose the attitude, we're talking about med school, here. Everyone's brilliant. And likewise, when you do finally get in, and you fail your first test, it doesn't mean you're dumber than everyone else either. Best of luck.