There are no guarentees. No matter how qualified you might be, how hard you work, and how tactically you apply, you might still not get into a US or Canadian medical school. Given how many doctors we know, as both faculty and alums, we are very well versed in the stomach-dropping panic at the thought of not getting in. Life is, of course, bigger than becoming a doctor, but then again, is it, really? For you?
There are exceptions but, for most people, becoming a physician is not a job. It's a calling. It's a vocation that is often intextricably tied to personal aspirations, sense of identity, even a philosophical contemplating of the role of a person in a society. It's only natural to feel utterly heartbroken, panic stricken, and out of sorts if after all the planning, all the work, it just doesn't work out.
You didn't get into medical school. So, now what do you do?