I have white small pimples on the shaft of my penis, with a ball sack thats always been itchy as was twice told its fungus, help.

Dermatitis: This sounds like it could be a fungal infection, but there are other possibilities as well. No STD causes symptoms like this, so that's not a worry. If you haven't been to a dermatologist, that should be your next step; or if you have, perhaps see another one for a second opinion. One way or another, effective treatment is available, so keep trying!