Why Does my Upper Lip Stick Out? (photo)

I'm not really sure how to explain my problem, but it seems like the area above my lip is not leveled with the skin on the front of my cheeks. It kind of makes it look like I have a monkey mouth. What exactly is this called and how can I fix it? I've only 21 and it seems to young to be having anything extreme fixed with my face. Any help would be greatly appreciated. Can it have to do with a slight overbite problem?

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