Accelerater shin pain - please tell me I'm not crazy.

Driving a new manual (previous cars have been fine!!). The accelerater is pretty light and you don't have to push it down much unless accelerating, but my legs been hurting so much on it. It's almost like a cramp in the muscle on the front (shin side). Wtf is this? It's distracting me and I end up cruching gears and making other pretty crucial mistakes. It's like my foot is bent - and held - too far up to my leg on it.
I've tried changing sest positions and all sorts. Only thing I can think is like a 3 inch cushion under that leg at the front maybe for some support.
I also get veeeery bad anxiety driving so am already tense af, which probably doesn't help matters.

I had a vehicle that did this to me - ended up using a lot of this on the front of my shins.

couldn't find a seat adjustment that helped, though I'm pretty sure it was the seat / pedal / leg / foot geometry that was causing it, could be that I've got pretty long feet and using the ball of my foot on the pedal meant I was putting the heel somewhere weird.
IMO it's probably not an automatic/manual thing as such.