Congrats on overcoming adversity and really good job on your parents behalf giving you ability to get where you are today. Adcom often looks at the progression and what one is able to do with the resources they had access to. One could be attending New York's best prep school but if they failed to apply themselves and failed to really do anything with that education to stand out, the Adcom will be unimpressed. On the other hand, someone who attended a village school and organized people, accomplished some very basic things that perhaps were inferior but required a lot of effort will get more credit. Bottom line - your effort and resilience will count. You don't have to succeed every time but you have to show effort, maturity, and ability.
In terms of narrating your story, it is a narrow path and I feel you could really use some help from an MBA student or alum or an admissions consultant to help with crafting that message. You will be applying as a Canadian resident/citizen since you are going to school in Canada but who will be trying to paint a story of a person stuck between the two worlds and the backdrop of Afghanistan.
At the same time, I would surprised if there were no other Afghan alums or students at HBS. It is a well known country that always sits at the top of every drop down list for address (which as a US citizen, I get somewhat annoyed with scrolling and wish I was from Afghanistan for a split second). I did a quick google search and found this:
https://www.alumni.hbs.edu/stories/Page ... x?num=4018 and possibly there is more but just not out there. I would do some research ahead so you don't make an statement that will show you did not do your research....
Very cool story and Good Luck!