I'm a trial lawyer, former amateur bicycle racer and I've driven exotic cars on the racetrack. Believe me, I was an alpha male. What I found was that all of my male mannerisms were learned in late childhood or young adulthood. A big part of unlearning them was to just let the hormones take over, relax, stop trying to be a man, and to get in touch with and follow my feminine instincts.
Once on hormones and dressed properly, I found that I liked to sit up straight instead of slouching. I liked to curl up instead of man spreading when on a sofa watching a movie. I like to sit up in the car with both hands on the wheel instead of doing the gangster lean. And I like walking with my back straight and my butt and chest out and my feet close together instead of dong the ape walk.
My best advice is to try to get in touch with the more feminine elements of your childhood (example: I played concert flute and collected girly bookmarks) in order to remember who you really are. Just relax, get in touch with yourself and do what comes naturally. It will come to you because it comes from your heart.
Hugs, Carly