First off, you need to understand that your chances as a Canadian are not the same as a US student. See: http://www.hio.harvard.edu/statistics.
There are currently 147 Canadians studying at Harvard who are freshman, sophomores, juniors and seniors. That means, on average, Harvard admits about 44 Canadian students every year (with an 82% yield that brings the average total down to 36 matriculated students per year) – and I imagine a good number of those students are going to be athletic recruits on the skiing and ice hockey teams. While Harvard doesn’t disclose the number of Canadians applying for those 44 slots, I would imagine the total is north of 5,000 students.
Secondly, for Harvard and the other schools on your list, GPA and test sores are a minimum threshold – everyone’s got to have that. Then Admissions will read your teacher recommendations, guidance counselor’s Secondary School Report (SSR), essays, interview report and EC’s trying to scrutinize your “character.” That’s an old fashioned word; it means the way you develop your inner qualities: intellectual passion, maturity, social conscience, concern for community, tolerance, inclusiveness and love of learning. Colleges learn of those things by comments made from your teachers and guidance counselor, as well as what your choose to write about in your essays and the “tone” and content of what you say.
The most anyone can say about a chance thread is that your GPA and test scores indicate you are a qualified applicant, but so are most student’s who will ultimately be rejected. You’re new here, so possibly you haven’t read this thread; It’s written by an MIT Admissions Director, but everything in it holds true for Harvard, Penn, Princeton, Yale, Brown and Stanford as well: http://talk.collegeconfidential.com/massachusetts-institute-technology/939227-reminder-no-one-not-even-me-can-give-you-an-accurate-chance-at-mit-p1.html
Best of luck to you!