nobody is really wired to me one hand or the other, we can all learn to be ambidextrous. your are that way because you just feel more comfortable/experienced doing certain things with one hand than the other, it's a formation of neuromuscular habit.

it's just a matter of practice, but yes, as children the adults around us often DEMAND we be one or the other. just like they demand gendered behaviors, etc. And children conform because adults like conformity.

it's interesting as an adult, like getting coaching and having to re-learn basic bio mechanics you 'assume' are some sort of default, because well, nobody ever told/taught you you could/should be doing things differently. like there are different way to hold pens for different styles of writing...

not any different really when say, comes to language use and accents. you have a 'native' one you got from your upbringing, but you can unlearn it and a lot of people do because they won't gain social acceptance if they retain it. when I code switch to my 'native' speech... people freak out because it offends them because I'm supposed to sound smart and 'educated' , not like a stupid working-class hick. and of course, the first year i came back from college all my family/friends basically asked me why i was such a douchebag and talked so pretentiously...