So what "middle powers" are listened to in the world?
Ones that actually have power, be it military or economic, and the willingness to use it. The UK, France, Russia, China, Saudi Arabia, Israel, Iran, Japan. These are all nations which regularly use their economic or military power to influence other countries around the world.
Canada has neither economic nor military power to wield. It's world influence is no greater than that of Sweden or Ireland.