My maxila is wider then my lower jaw

hey, my upper maxila is 43mm and my lower is like 38-39mm so my chin is a little bit recessed but its prominent and i got a good jaw im getting braces for my lower teeth in this month, is it normal im 15

 

[Forrestmaxx]

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[42balintt]

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I dont want to post myself, but i found a picture that almost 100% similiar. Also the distance is 36mm on the lower one not 39mm

Like between these two pictures