Remember that you also have to account for the fact that it is being filmed and that the lenses used can and will "distort" the image in one way or another. Depth perception and scale is more difficult on what is ultimately a flat image when watching it on your screen.
I had the same situation with a model who's boyfriend looked way bigger then me, then when I asked her, turns out we are the same size.
On camera (and on screen) it all just looks different then in real life.
I wouldn't get too hung up over it and don't worry with chicks in real life.
5.7 is in the Goldilocks zone of compatibility/pleasure and remember that these bitches have to conform to your frame and your shit, not the other way around.
If she doesn't like it, she can GTFO and just bounce to the next chick. There are plenty who will not nag and complain over something you cannot control.
Don't let them and their horseshit get to your head. They don't know what they want and neither do you (and it isn't your job either). You got this, I promise.