Smelly Feet ... yuck!

Of late... actually almost all my post-puberty life, I have had problems with my feet. I can't wear closed shoes as my feet get too wet and a little slimy (gross)! Yet, I've tried putting a cloth insole (still wet); sprayed anti-perspirant (feet felt veryvery dry); and powder. None worked, obviously. The spray did work, but a little toooo well. Feet felt very dry and waxed over.

Not only that, even wearing open toe shoes leave my feet a bit smelly.... WHY?

Any help?