Do you have any facial hair? If so, and its dark, maybe you can try the "mascara trick." Take mascara that matches closer to your hair color (I used black, even though my hair is dark brown) and use it to color any facial hair you have. If done well, no one will know that you're darkening it. It might take some practice, but keep at it!
If you don't have any facial hair, it might be the way you wear your hair. Try a man's haircut. Go to a barber or male hairdresser and have them cut it.
Do you bind? If not, maybe give it a try. There are plenty of threads here that can help you do so safely. Also, wear a loose shirt that helps hide your chest.
It could be the way you carry yourself. Try going to a public place, such as a mall or coffee house and people-watch the men. Observe how they do things, from drinking their coffee, carry bags, even to how they sit.
This thread also might help. The ladies on here discuss how cis men do things, and even though I pass and have for well over a year, (the pic is me cosplaying), I learned things from reading it. Its a thread I really should take notes on.
Being Socialized Female 101Hope this helps you in some way. Good luck bro.
Ryuichi