Normal means that there is a bell-curve distribution of how insecure individuals would be; you'll see both more and less self-confident individuals. However, if you barrage the populace with photoshopped, top 1% in beauty, frankly unhealthy bodies, that distribution is going to move to the "right" towards more insecurity. I'd wager anyone susceptible to insecurity would experience a much greater level, than in a poor farming town where young people see almost no sexualized supermodels or celebrities to compare themselves to.
For example, take some 13 year old girl, probably a poor farmer, from Ireland in 1800. She will have seen almost no examples of the female body except her own, her peers rarely, and her familial elders. Then plop her down into today's world, and she'll definitely be barraged by all the most ridiculous images of flat stomachs, huge anatomical parts and tiny anatomical parts, immaculately photoshopped forms: she'll be made to feel less than them.
For example, take some 13 year old girl, probably a poor farmer, from Ireland in 1800. She will have seen almost no examples of the female body except her own, her peers rarely, and her familial elders. Then plop her down into today's world, and she'll definitely be barraged by all the most ridiculous images of flat stomachs, huge anatomical parts and tiny anatomical parts, immaculately photoshopped forms: she'll be made to feel less than them.