Wanting to experience high school in Canada is a big dream, but the financial aspect is definitely daunting. I can understand your dilemma between following your dream and not wanting to burden your parents.
It reminds me of when I had to choose between going on a big trip to one of the
biggest theme parks in USA or saving money for other goals. In the end, I went for the trip, and it was amazing, but I had to make sacrifices afterward.
Maybe consider exploring alternative options like Work and Travel. It might not be exactly what you envisioned, but it could still provide valuable experiences without the financial strain.