You have been lied to your entire life. Every map that you’ve ever looked at (which uses the Mercator projection, anyways) gives a false impression of a country’s actual size. Since the Earth is a sphere, it’s tricky to map out each land mass on a flat, two-dimensional surface. What you end up with is a distorted map where the relative sizes of countries are out of whack.
Watch the gif below to get the gist of it: