Being a model is more about being thin or having a certain body type than being beautiful. In my opinion, there many more gorgeous "normal" people than supermodels (without hours and pounds of makeup).
Anyway, it varies. I've come across more people who think they're less beautiful than they actually are, but there are still a good number of people who are very vain and high in self esteem who think they're super hot.
And I find no issue in a person loving themselves and taking pride in their appearances.
I have no clue. Only like 5 % probably look like that. As for me I just describe myself as a pretty girl , who looks like the manic pixie dream girl when wearing red lipstick , and like daria with out makeup and glasses XD
Really? To me it seems like people usually underestimate their attractiveness. I guess there are some who are incredibly narcissistic and cocky. In those cases their personality makes them appear less attractive than they actually are physically.