Some of the higher end bindings nowadays, have an angled footbed, known as a cant. They come in different heights & angles.
The painful feeling you're having isn't unique to you, many people get it.
Do what I suggested, cut out a piece of foam & put it under your boot, on top of your binding.
This is just what we did to address the problem 20 years ago, before bindings had cants.
Here is someone else's DIY cants, this method just takes a bit longer & is a bit more technical.
Cutting a little triangle & sticking it there is just the fastest way to get er done.
How about just amuse me, & stick something under there. You don't have to glue it or even stick it there. Just put it there, step on it & do your bindings up.
Pretty please, right fuckin' now.