How severe is my underbite, and can this be fixed with braces alone? (Photo)

Hello. Good day! I am 23 and I have an underbite and would like to know how severe this is (please refer to photo attached). According to my previous dentists, my lower jaw is okay, only that the upper is underdeveloped. Can this be fixed with braces alone? Because surgery was never mentioned to me, but some of the researches I've done says that most underbites are corrected by surgery, which I hope won't be needed in my case. Thank you.

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