The answer to that is simple: your face is the wrong way around.
In the mirror everything is reversed, but you've spent your whole life looking at yourself through a mirror, so that version of yourself
is what you're used to seeing. Your brain tells yourself that your reversed face is considered "normal".
In photos and videos, that's what your true self actually looks like and what everyone else sees. But you think it's weird because you're not used to seeing that version of your face all the time.
It's all psychological. But yes, you are uglier than you think. Have a nice day.