Even if you send a balloon up to the stratosphere, you've only gone 12-50 kilometers up. The redbull guy only went up 39 kilometers (24 miles), just about two thirds of the way up into the stratosphere. The earth is 12,742 kilometers (7,918 miles) in diameter. We are so tiny and insignificant it can be hard to conceptualize.
People can be misled by infographics like these.
Despite being packed full of information, none of these pictures show the true scale of the earth.
Our atmosphere is like the skin of an apple