As a non-transitioning nonbinary partial transmale, I don't represent many on this forum.
Yet I have always assumed I'm male. I have also always known I'm bio female, yet I never really thought about it.
It's a knowing. I have never tried to be accepted as male, tried to dress as one, or tried to copy males. I'm just who I am.
I have, however, occasionally tried to copy females, once I realized I wasn't acting like my cisfemale relatives and friends, but I couldn't keep it up more than a few seconds.
My transwoman friend from high school constantly obsessed about passing as female, being accepted by other women, etc.
I couldn't understand it, but it may be because she was planning to transition completely.
Another nonbinary transwoman friend seems unconcerned with acceptance, and isn't even planning to have surgery. She just wants to wear women's clothes, makeup, and live the lifestyle.