Getting into character

Simon Neil, Biffy ClyroOk, so having said that I like writing shorts, I am now trying to make progress on the long, the novel, the proper book. The first-person narrator is Jeremy, a normal working-class bloke who's a natural dom. I'm having to write a character profile, because I'm struggling to get into his head. I have no trouble writing from a male viewpoint, but male and naturally dominant is fucking with my brain. 

So I've written him a little confessional-type history and then I th...