People are social animals: it's in our nature to crave approval from those around us, and it's only normal to want to be accepted -- and, more than that, admired. In this image-obsessed society, it makes sense that we'd want to get an idea of what others see when they look at us. Are we pretty, or are we ugly?
Modeling, and especially living your life in the public eye, is by far the hardest thing I've ever done. We are breeding a generation of young girls and guys who think their worth is based on their looks and how many "likes" they get. You can say "It's always been this way," but I can tell you, it hasn't.