Because we are different now, we know how to dress up, we know how to fix ourselves, we were influenced by the people we spend our time with.
Isn't it nice to know that we also have the confidence to show how we look when we were younger? That you even tell yourself how ugly you were and laugh with the photograph you're holding. It's fine with you now, because you have changed. You look better than before. It's just so nice to remember memories from the past.