Shyness is inherently uncomfortable; introversion is not. The traits do overlap, though psychologists debate to what degree.

Though shyness per se was unacceptable, reserve was a mark of good breeding.

I think the shyness one feels in childhood is often overcome with time. There are children who hide behind their parents' legs, but you don't see grown-ups hiding behind people. It just doesn't happen. I mean, not that often. People develop social skills over time.

Introverts .. may have strong social skills and enjoy parties and business meetings, but after a while wish they were home in their pajamas.

you once said to would like to sit beside me while I write. Listen in that case I could not write at all. For writing means revealing one self to excess; that utmost of self-revelation and surrender, in which a human being, when involved with others, would feel he was losing himself, and from which, therefore, he will always shrink as long as he is in his right mind...That is why one can never be alone enough when one writes, why there can never be enough silence around one when one writes, why even night is not night enough.

Introversion- along with its cousins sensitivity, seriousness, and shyness- is now a second-class personality trait, somewhere between a disappointment and a pathology. Introverts living in the Extrovert Ideal are like women in a man's world, discounted because of a trait that goes to the core of who they are. Extroversion is an enormously appealing personality style, but we've turned it into an oppressive standard to which most of us feel we must conform.

We often marvel at how introverted, geeky, kid 'blossom' into secure and happy adults. We liken it to a metamorphosis. However, maybe it's not the children who change but their environments. As adults they get to select the careers, spouses, and social circles that suit them. They don't have to live in whatever culture they'er plunked into.