Tax evasion is a serious crime that can have serious consequences. You may want to contact a lawyer or tax advisor right away to discuss your situation and learn how best to handle your particular situation. In general, if you have knowingly or unknowingly avoided paying taxes, it is important to acknowledge your mistakes and try to solve the problem, for example by contacting a professional.
Ottawa Criminal Lawyers has helped people in similar situations to yours, so you may be able to get away with it.