Is there anything I can do to fix my crooked smile? (Photo)

I am 18 and have had braces twice for a total of 5 years.I still wear my retainer every night yet my teeth have shifted.My mouth is pretty small and from looking at the pictures I am convinced it is crooked.When glancing in the mirror one of my two front teeth is an inch longer than the other.It is very upsetting and I never smile because my teeth are so messed up.Is there anything I can do to fix it?I feel like in the pictures you can't see how truly slanted they are.

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