How can I fix my laugh? (photo)

I'm 19 and I didn't have any kind of dental procedure done in my life-not even braces. I find my laugh quite odd looking and surely not pretty. I think my front teeth are big or maybe there's a problem with my gum line-I'm not sure. Do I need to get my teeth fixed? Or this isn't really a teeth problem? If this is a teeth problem then what can I do to fix that? Please suggest me.

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