Are there people specialized in changing one's own behavior and mannerism?

[John]

I was raised in quite an antisocial and formal environment which demanded little to no physical activity. As a result I never really developed a "natural" swinging of the arms, my behavior became femenine due to having most human contact with my mother and sister and my movements are pretty much forced, weird-looking or too stiff.

I want to know if there are any people out there specialized in changing one's exterior way of being and behaving (nothing related to personality or the such, though that could be a bit useful in certain aspects), to correct my movements into something more masculine and/or natural, which would help a lot.

Thanks all in advance