BS/MD is difficult not because of your EC’s. It’s difficult because it’s difficult. Too many applicants chasing too few seats. The U’s have the luxury of weeding out anyone who doesn’t seem to understand what a career in medicine involves. That’s why the volunteering is important- not because it’s a box to check, but because it is tough (even with shadowing) to convey the “why” of a career as a physician without experience working on the people side of the equation.
If you write about wanting to "help people’- heck- the Adcom’s know you could become a social worker, speech therapist, occupational therapist- a few dozen careers which are less time and money intensive than becoming a physician. If you write about your love of medical research and discovery- again- go get a doctorate. It’s a tough needle to thread to be able to convey why you want to be a physician. Patients are smelly, and cranky, and combative, and in pain, and sometimes bleeding from every orifice.
Since you haven’t had much hands-on patient experience, my suggestion would be to table med school for now. Give yourself the luxury of an undergrad education. Maybe you end up applying to med school or maybe not. But that allows you to put your best foot forward with the person you are right now, today, without tying yourself up in knots trying to get the right kind of experience this summer.
You are clearly a talented kid. why not apply to the places which will love you and want you just as you are?