I think everyone is susceptible to insecurity; I am not overweight by any means, but since I am not incredibly underweight like I used to be, I feel fat as hell. And yeah, a lot of it has to do with how women in media look.
I wish guys would stop comparing themselves to porn too. There's a reason those guys are in porn, and I've NEVER seen dicks that big in the wild. I think I'd run screaming if I had. Owwwww.
Conversely, I have also felt 'weird' after watching porn, due to how the ladies look, but I realize that bleach is a thing and move on.
Its funny because I feel like it hits both sides. You mentioned how you felt weird after watching porn. I'm not against porn by all means but I do think its having an unhealthy attitude towards how we view sex and what is "normal" in society.
My wife was and still is very naive when it comes to sex. Thats what happens when your parents are sunday school teachers and grow up hardcore Catholic in the Philippines

Slowly but surely she's getting out of her shell and realizing she can be sexy as herself and for ourselves. But prior to her actually having sex her only "experience" was seeing porn that she was curious about on the internet, of course her expecations were completely warped because of it. I've had preivous girlfriends who ran into the same thing, first coming into contact with sex via porn.
I don't think it causes permanent damage or even damage at all of course, hell my first "sexual" experience and awakenings was the
goddamn tree scene in the Last Unicorn and to this day I have an unhealthy fear of large breasts
But yeah people will watch porn and their expecations are completly warped by what is expected. This creates insecurity and the cosmetic industry profits greatly from it. I just wish one day after encouragement from me and friends that she doesn't have to worry so much about her looks. She's fucking gorgeous. Which regardless, she's my wife, I'll still love her even if she's underweight, or even when we get older and she jabba the hutts up. I'm seeing improvement every day in her own self image but of course I don't think that will ever go away completely. I suppose some of it can be healthy? I mean from an evolutional standpoint isn't it just all biology anyway? Survival of the fittest? Hell its why we have breasts and nipples and clavicles and all those sexy things that are on people. It's stimulus response
Actually come to think of it, it brings up another discussion. So if men are for the lack of better term "pigs" for hnnnnng and "bewbs" talk, is it again just exploiting the nature of men when marketing is telling women they HAVE to look like that?
I guess we should kill all the marketing experts. Bill HIcks was right
Or really its up to us, men and women, to look beyond that and realize we're more than our base nature.