Would be happy to help review your resume (privately if you prefer!) if you'd like to share it.

I think there is definitely racism prevalent in IT.

But it's also possible that there are other factors here; simply being unfamiliar with your university and whether it's a good one makes you a harder choice than someone at a well-known US school, there are more perceived unknowns about you. If you have something like a bunch of GitHub projects to point to, that would definitely be reassuring.

(Also, I'm not sure which US/Canadian companies you're applying to, but the well known tech companies are extremely hard to get into, even for US applicants. The number of available internships is tiny compared to the number of CS students who want an internship.)

Racism is widespread across all segments of society so why would IT be any different? That being said, the reason why you are probably not hearing back from companies in Canada and the US is due to very strict immigration policies. Companies based in those two countries already have a hard enough time trying to secure H-1B visas for full time employees with advanced degrees so imagine the orders of magnitude required to bring in someone still in school for a summer internship. (Being a straight A student in your local country simply won't cut it.)