That's nice, dearie. Now try driving IN New York City. What do you see? Cars and people EVERYWHERE!
Ever tried to take a subway-train-ride in Tokyo? Me neither, but I have seen the station employees pushing people onto those trains, on TV.
Heck, it's enough to try to drive across Gothenburg, Sweden ("only" 930 000 people live in and around it) during rush hour, to know that there are MANY people about.
Just because some parts, like Sibiria, northern Sweden and Greenland, and the center of the Saharan desert are a bit empty, doesn't mean that the Earth is not overpopulated. It's not just space, ya know it's resources too. There is not much to be found in Sibiria and northern Greenland, but ice and cold, and Sahara desert is mostly sand and heat.
The Earth could perhaps feed as many people as we are now, IF the resources were evenly distributed. But, they aren't; in the Northern hemisphere there are people who are lethally obese, in the Southern hemisphere there are people who are dying like flies in famines. If we "up here" gave a third of what we have to the people "down there", we could all be sufficiently nurtured. But we don't want to, and instead invent myths about overpopulation being a myth, so we can keep our surplus for ourselves. (It's not really that black and white, of course, there are obese people in the South and there are starving people in the North.)