This isn't just a matter of girls who actually are kind of ugly having body image problems. That's still bad (they should value it less highly, they often underestimate how attractive they are, etc.)
But a lot of women, especially those around high school age, are just completely irrational in this realm. I know lots of women who are very attractive in conventional ways but aren't happy with their bodies. They think they're too fat because their stomach isn't totally flat, even though they look just as good as if they were that skinny, and they're only 5 or 10 pounds off. They think their breasts are too small. They fixate on small imperfections like a little bit of acne.
This all happens because society puts forward an airbrushed ideal of perfection that they're told to strive for even though it's totally unattainable. They see all of the small ways they could be better without taking a step back and realizing how attractive they really are. The fact that lots of men are interested in them doesn't convince them otherwise. They'll claim those men just like them because they're nice, or that the men are just interested in anyone who they think will put out, or some other mediocre excuse.
But a lot of women, especially those around high school age, are just completely irrational in this realm. I know lots of women who are very attractive in conventional ways but aren't happy with their bodies. They think they're too fat because their stomach isn't totally flat, even though they look just as good as if they were that skinny, and they're only 5 or 10 pounds off. They think their breasts are too small. They fixate on small imperfections like a little bit of acne.
This all happens because society puts forward an airbrushed ideal of perfection that they're told to strive for even though it's totally unattainable. They see all of the small ways they could be better without taking a step back and realizing how attractive they really are. The fact that lots of men are interested in them doesn't convince them otherwise. They'll claim those men just like them because they're nice, or that the men are just interested in anyone who they think will put out, or some other mediocre excuse.