Agree with mama_annie.
Best to know your own strengths/weaknesses and keep a balanced life. Whatever character we have, do bear in mind that we need to communicate effectively with other people. Even if one prefers peace and quiet (or the reverse), just make sure we keep healthy esteem, speak up when necessary and live fulfilling lives.
For those who are working, I think every boss/colleague will appreciate some sort of verbal affirmation and clear communication. Just as we treasure moments when others praise us for our efforts and give honest feedback. Introvert doesn't mean anti-social/hyper-sensitive, correct me if I'm wrong. I don't like the fakeness during events etc but if it's part of work, I guess one has to fulfill professional roles (eg. attendance, explaining plans and also mingling with clients) when required.
I'm naturally extroverted but after having a kid, I do prefer a more sedate/homely/'introverted' life. Still meet friends, go out and have fun with family BUT have totally eliminated formal functions and unnecessary events since stop working.
Better to have sincere friends than many hypocrites who are just keen to 'kaypoh' about. I totally agree with sungrapes on this point and also "mind over matter".