How long walking till they start to hurt? If it’s less then 30 min it’s just too small and that’s the reality.

Shoes aren’t suppose to hurt your feet. Your only damaging the way U walk and everything else above if you force it. Don’t listen to people telling you to stretch them, they don’t stretch that much the plastic only gets softer the more you use it.

Try a return. Most places accept that or store credit/swap. Otherwise sell them private.

Sorry mate