I think it's also to do with how photogenic someone is. I'm the same as you, my photos/videos/voice always feel weird and awkward to me. The other day I came across this relatable story:

My mother is gorgeous. Stunning, even. She was homecoming queen in high school and has the smile of a true crime cliché (that is to say, it lights up a room). Blonde, razor-cut bangs frame her big, brown eyes – rimmed in her signature liquid liner, always – which literally twinkle when she laughs.

There is no photographic evidence of this.

I cannot make sense of it, but something happens to this dear, beautiful woman whenever a camera comes near. Her face contorts at the click of a shutter. A combination of the following features appears in every picture she’s ever taken: squeezed-shut lids. Crossed eye. Eyebrow askance. Elvis lip. Cowlick. I sometimes insist a particular picture isn’t as bad as she thinks; I’m lying. Her driver’s license photo? Horrendous. Her Facebook profile picture? A close-up of the family dog.

I take comfort in this whenever I come across a less-than-flattering image of myself. Photos do not reflect reality, I think. Just look at all the terrible pictures of Mom!