I dislike the look of my face when I smile; what do I do? (Photos)

Whenever I smile, my face looks so wierd and i feel so ugly, and i know there is people in the world with much bigger problems, but this ruins my confidence.... If anyone know of why this is happening, or something that can help? In photos, it looks terrible, but in some mirrors with a good light, it looks ok. But in some other mirrors, it looks bad again...i am so confused

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