The Gawker published an article from a Harvard graduate that did interviews for Harvard undergraduate admissions for 8 years.
This article gives some insight into what the admissions process at Harvard, and highly selective colleges in general, are like. You will see from the article that just being smart and involved are not enough.
Every year I have a handful of students that apply to Harvard and despite their incredible intelligence and talents, most are not admitted. Does this mean that those not accepted are not qualified? In most cases, the answer is no.
But you know what? All of my students end up at great colleges, many of which are much stronger than Harvard at getting students into medical school.
Keep your eye on the prize which, for most people reading this blog, means getting to medical school. And while Harvard is a great school for some things, there are a number of great choices out there if becoming a doctor is really your goal in life.