I occasionally bite the inside of my cheek allways on the back right,It is accidental but sometimes it swells a little and then the swelled part sticks in between my back teeth and it becomes unavoidable. I try to prevent further pain by pushing cheek outwards using my tongue.However you cant eat then ,looking for way to keep inside of cheek away from back teeth
Over the years I have bitten my cheek on the left side so much I have scar tissue I can feel with my tongue. My dentist says an oral surgeon can smooth it out. Maybe see your dentist and see what he says before you do this to yourself too often.