while it is poddible that shyness is (partly) cause by your genetid make up, it is my belief that learned behavior (the nurture part) is much more powerfull. there are so many cases of happy, healthy, vibrant and out going children having their personallties ravaged by abusive parints or other traumatic situations. and, belive it or not, the oposite is also true, quiet, timid, withdraen people can become meri sociable in the same way. catatonics and autims can be brought back to live, people with " learning disabilities can become fully literate. it justtakes the right tools.