Most Helpful Guy
It could have something to do with the way you perceive yourself. Technically, according to cognitive psychology, everything around us is nothing more than in our minds, because it's how our mind interprets our world that we come to know it. Which means that you could very well see what you want to see when you look in the mirror, whereas the photo will show you what is truly there, or, maybe, you have something against cameras, and the stigma that you aren't photogenic could actually allow you to perceive yourself in that way. When you feel differently, you do look differently, also. You know how people tell pregnant women or those who're recently engaged that they're radiant or glowing? The way you feel can influence how you perceive yourself in a mirror. This could all be completely quack though, but this is what cognitive psychologists would probably tell you. It's all in your head.