And here we have the true answer. All the other answers are a form of "stop being an introvert" thus denying your nature. Accept yourself, be at peace with yourself, live the life that gives you inner peace and as much happiness as your nature allows.

Don't listen to the people who try to change you, only accept change if it comes from within although it is possible for this to happen because of how others interact with you and how that makes you feel. Don't change just because someone else says you should be more like them. Then you become their puppet, not your own person.

Also, don't be a dick.