Being in almost exactly the same boat, I would have to agree. I was a decent student in high school. There were those in my class who were certainly better off

Being in almost exactly the same boat, I would have to agree. I was a decent student in high school. There were those in my class who were certainly better off academically in terms of GPA, those who presented at ISEF, etc. When that handful of students and I applied to MIT however, only I was admitted, for reasons I attribute to my passions and interests which I simply could not have explored in a meaningful way through any "sanctioned" or school-sponsored activities. My guidance counselor as well as extremely discouraging, however after being at MIT for two years, I'm inclined to say that admission to a university like mine hinges on both being an interesting person and possessing demonstrable intelligence - not necessarily through scholastic channels.