I agree with the rest, it's more in how you carry yourself. Yeah if you're suuuuuuuuper feminine looking it's going to be a little harder to "pass". But if you feel male on the inside, it's going to show on the outside.
I'm with ya Zombie. Except now I guess I'm used to breathing with tighter lungs lol. I notice even after I unbind at night, I still breath the same as if I was binding, because I"m so used to it. Another thing about " deepening" your voice, try not to do it unless you got it down flat, otherwise people can tell you're "trying" to talk lower. I know a lot of bio males with higher voices than me, talk comfortably and you'll be fine.
And tell your friends that accept you to stop busting you out like that. It's not their place to be telling others about you.