Talk with your parents about the fact that it is YOUR life, not theirs. If they are paying for your education, maybe you’ll need loans if they don’t support your goal.
If you are interested in becoming a business teacher, a business degree might help and then you can take your BEd afterwards. I’m not sure about other parts of Canada, but in Ontario you need a 3 or 4 year degree and then a 2 year BEd degree.
Look into schools in your area and see what they require. Good luck!
Teaching In Real Life 