Do you really think your the first person to tell their girlfriend something and for them not to believe it?
My girlfriend is self consious about a few things and at the end of the day shes a good looking girl, dosen't matter how many times i tell her she aint going to listen.
Its just a woman thing, you say things like "you look really good in that dress" and they say "no i don't it makes me look out of proportion", "you have really nice eyes" they say "no i don't their a horrible shade of "insert colour".
IMO its just what woman do, the only thing you can do is just keep telling them their beautiful.
you can tell your girlfriend has some sort of asian origins from her features , but that dosen't change the fact shes a goodlooking lass, as i said just keep telling her that, she won't ever belive you, but its better than saying nothing
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