Hey there 'pizza-anytime',
The thing that comes to my mind is your oven.
if your pizza was white and soggy on the bottom, this to me, means that your
bottom oven element is not working properly.
Did you pre-heat your oven for a good 20 mins - 30 mins ?
By this I mean, you get your temp up to 500 degrees for example, and then you count
at least 20 - 30 mins before you get that pizza in there.
Many people I know, will actually throw a pizza, or a pie, or whatever into a stove while
the oven is pre-heating ! ( yes, many actually do this, and have been doing it for years and
don't know they are doing something wrong )
In any event, if the oven has been pre-heated properly, the bottom of the pizza should have been
done quite a bit.
However, perhaps it could have been something with the dough.... ? ... was the dough very wet ?
good luck with future pizzas.