I inherited them, too
They have caused me years of misery. As the foot rolls inward because there is no arch, it screws up the bones in your ankle, which screws up your knees, and then the hips and back. Thelack of an arch can stretch the ligaments with all that pulling & then your ankles will be weak the rest of your life.
Go to a podiatrist, preferably one who is also an MD, for an evaluation. There is no surgical fix that I know of. You need a
custom orthotic to raise your arch and put everything else back into line. They have really been a tremendous help for me. They are expensive (about $300) but sometimes insurance covers them.
DO NOT waste your money on over the counter, ready made orthotics. They can actually cause more damage to your structure by overcorrecting the arch. You cannot afford to pound on your feet by running without resolving the arch problem. Shoes alone cannot fix the problem, either.