why do we look different in pictures from the front side camera on instagram?

[Gareth]

It's because mirrors show the true you and they are very clear,cameras for images and videos uses pixels and they do not use enough pixels to make an image of you or of anything so the image you see of yourself in the mirror is much more closer to how you look in reality than using camera.Even mirrors aren't 100% of the real you,The true way you look 100% is the way that other people see you so in reality you don't actually know what you look like!lol! I know it's creepy and mind boggling!

Mirrors are the best closest things on earth that I can think of that shows how yourself looks like.