Do I understand Flat feet?

Im 13 and I play Football. This last season both of my shins had stress fractures on them (this was before contact started). I was diagnosed with Flat feet at. So they told me to buy inserts and Physical Training. This season has been going great but Im feeling a sore pain on my arches of my feet, and im wondering if my inserts are causing this. But my shins are fine so I guess the inserts work but come on I clearly have no flat feet! Im just so confused I've looked up pictures and my feet look nothing alike.

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