In a travel piece on World Hum, Sophia Dembling states:
"Introversion and extroversion are inborn traits, and the difference between them is not that one is gregarious and at ease in the world and the other shy and awkward. Rather, extroverts are outwardly motivated and gain energy from interaction with the outside world while introverts are more inwardly directed and drained by interaction with others. Introverts’ thinking tends to be deep and slow, we require copious time alone, we prefer probing conversation to shallow chitchat, and our social lives are geared more towards intimate one-on-one interactions than “more the merrier” free-for-alls."
If you love the quiet, prefer to write alone, shun the questions about your writing, and run fast when the conversation turns to critique groups, you're a darn good introvert.
If you're an extroverted writer you probably prefer to hear people tell you their stories, and you write in public, enjoy sharing your work-in-progress, and trading stories with other writers about the craft.
Either way, you're doing what's right for you, of course, but its nice to recognize your tendencies and take comfort in silence or among friends, as long as it feeds your hunger to write and helps you write well.