I got my PF from hiking in the mountains in inappropriate shoes. I, too , thought my feet were indestructable and thought I was just out of shape when my feet starting hurting from the hiking. I also have gone barefoot when riding bikes and doing the Stairmaster - back in the old days before I knew that something called PF even existed. I cringe at the thought now.
This condition is so frustrating and so depressing. My whole life has changed and it is very hard to keep things in a positive perspective. But, this site has given me hope that time and patience may eventually result in having "normal" feet again.