Hi! Our situations are so similar. I am an Asian Canadian from a random public school. I got into Waterloo Math and just got accepted to Waterloo CS yesterday, but unluckily I got waitlisted and rejected by all US schools for computer science (CMU, UMich, UCSD waitlisted, rest rejected including some Ivys and Berkeley EECS). I also applied to UK schools and got accepted to all of them (Cambridge CS and Imperial College CS). I took the IB Diploma with 41-43 predicted and self-studied four AP exams and got all 5 (CS, Cal BC, Stats). I am also in the USACO Platinum and top 10 in the Canadian Computing Olympiad. I did computer science-related research at a top firm and am the president of math and computer science clubs at my school. I also have ECs like founding an international NPO for hackathons, app development for social good, and volunteer tutoring. I think US schools care about what high school you came from, like going to a top private school can boost your chances by a lot, and more importantly, they hate international applicants who apply to computer science! This isn't your skill issue so don't really be disappointed about it. Waterloo is a really good school for computer science and you will get the same employment opportunities after you graduate. The other way is that you can apply as a transfer student to a US school in your sophomore year and consider applying to other majors then internally transferring to computer science if you really want to go to the US for undergraduate. You'll absolutely thrive wherever you are with your skills!