I believe domination and submission, like most other sexual things, is more of a continuum than a simple thing that someone either is or is not.
Very few people I believe are fully dom or sub, the vast majority have some of each inside them. Just because you are more fully submissive than others doesn’t mean that they are not a type of submissive.
I think many people who demonstrate such attraction to that movie and to being submissive are far closer to the middle of the scale between dom and sub than anyone who participates in such things, certainly anyone who participates full time.
As for the analsexandcoffee post you mentioned being such a fan of, first off it feels really great to see such appreciation for some of my writing. I suspect I was not the last guy you had sex with but I might be similar to him. That particular piece was written with a specific woman in mind, and while she can certainly be very submissive at times she can also be dominant as well and enjoys the variety of switching back and forth. Although in her case the two roles also tend to align closely with the gender of her partner (she’s sub with guys, dom with other women). I also feel some joy in sometimes being dominant and sometimes being submissive. And actually more of my experience is on the submissive side so your interpretation of me as a natural dom is surprising as well as very complimentary in my eyes.