It seems like everything except walking came naturally to me, and that's mainly due to nature. Even then I have a psuedo-masculine walk. My voice has always been feminine, though unless I'm speaking up it sounds neutral nowadays. I hate the way my voice sounds honestly, but there's nothing I can do about that nowadays.
People have never tried to repress my behavior, and when people try to make me more feminine they fail.
I have little concept of feminine mannerisms honestly, at least consciously. I'm feminine, I know that, but that's personality and interest wise. In terms of manners, I just come off as a reclusive and polite boy.
The odd part is, if it were up to me I'd rather not appear so masculine. But it's just the way I am, so I don't care much.