Advertising create an unrealistic world for most youth. For girls its all of the photoshopped bodies and perfect teeth and heavy makeup. For boys it about all the trucks, car and sports that they'll be forced to play someday. Also for young women sports or engineering toys aren't very apparent in any advertisements which leads them to believe that they can't build, or play sports or throw a ball around.
Advertising creates a sense of perfection that young girls strive to be but cannot succeed. With perfectly straight teeth and photo-shopped bodies and heavy make up. It pressures young boys in to playing sports they may not even want to play, buy the biggest baddest truck. It is false reality.