Um no. There are actually a fair number of nontrads out there who had lives, careers, military service, leadership roles before med school. And even traditional students have very differing accomplishments. It's the minority that look vanilla generic.
But even in the most structured of interviews, if you wait for them to give you the opportunity to "sell yourself" you've already failed. When you have a conversation with someone and come away impressed, they have "sold themselves". People who are good at this don't come across as doing the hard sell, but certainly will steer the conversation to topics in which they can present themselves favorably. That's a form of selling yourself.