So, your problem may lay with:

1) Your seat
2) Seating position
3) Shoes/Pedals
4) Pinched nerves
5) Restricted blood flow
6) Some or All of the above

Maybe find out about different seats and try that first. That would be cheaper than buying pedals and shoes.

Good luck


EDIT:

You wrote "balls OF my feet go numb". I read "balls AND my feet go numb".

Hahahahaha!

My recommendation has changed. Get clipless pedals and good shoes that fit properly.