The reason those people become models is that they are unusual. They are not normal. They are unusual, AND they are airbrushed and bathed in special blemish-obscuring lighting. You are normal. And you are most definitely more beautiful than you think you are.
Beauty ideals vary from culture to culture, and even in the same culture, ideals vary over time.
In one society I learned about in an anthropology class, if you were a woman, the fatter you were, the more attractive you were. Even in the U.S. in the 1950s, the ideal look was very different from what it is now. Usually gay men in the fashion industry. They don't give a shit what they are doing to teenage girls and women of all ages across the country. Right now, models look like men in drag.