Isabelle,
I am a Canadian student, studying at a Canadian medical school. Canadian schools are considered on par with American schools and graduates of Canadian medical schools are NOT consider FMGs when they apply for residencies in the USA. However, Canadian medical school admissions are probably more competative than it would be for you at many American schools, so it isn't really an option for those who do not have the scores to get in to an american school.
If you have any more specific questions I'd be happy to try and answer them.
Good luck.