Most Helpful Guy
Beauty is the eye of the beholder. Flaws in my book a generally identifying markers, i.e. you are this. They provide a visual map of experiences and memories. I got this scar doing this, I broke my nose doing that.
The person you are with is with you because of your "flaws", He just doesn't see it that way.
As the person looking at yourself, you have looked at yourself your whole life. You form opinions on what is wrong with you through the combined experiences of what you have learned is attractive from media, from idiots, from whatever. You overanalyse yourself, and you sometimes find things on the internet to back it up.
It is a mental mindset and, I hope the person you are with can convince you to change that because in his eyes, you are, for all intents and purposes, his world. (and the world is full of beauty).
PS Wow... what did I just write...