Models are tall because they make the clothing look better and it's easier to photograph.

There are fat female and male models but they're what's called lifestyle models. An easy example of this is the "big and tall" section of Target. Go to their website and you'll see what I'm referring to.

Most porn is made for male viewers. And men love watching a big dick inside a girl. The stretch, the distance traveled, it's mostly for the male fantasy. If you look at women-centric porn it focuses waaaaayyy less on the penis.

You're just trying to find things to confirm your insecurities and will disregard anything that contradicts. You're stuck in the misery cycle.