One side of my face is majorly different then the other? What can I do? Costs for surgery? (photos)

One side of my face is majorly bigger then the other.. it's so noticeable especially in pictures. It's something that has brought down my self esteem so much and I've been thinking alot of getting it fixed I'm just not sure where to start.. is it a deformity? What can I do? what could be causing the problem?

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