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One of the secrets is to not be ashamed of your personality. It is who you are, you can certainly improve aspects of it but dont forget your core values and what you think is right and wrong. Chances are, you are a great person.
I think people are introvert or extrovert and there is nothing much to do about it. You can learn to be more extrovert but it will be playing a role.
If you arent truly introvert but merely extrovert with a fear or inhibition that makes you introvert (seemingly), you can work on it. In that case, confidence is what you need.
There are theories, however, which suggest that one's level of introversion/extroversion are state, or context dependent. In other words, you may be extroverted around a particular group of people simply because you feel intimidated by them, whereas with others you may be more sociable or 'interactive' because you feel more comfortable among them. Regardless, I believe one's level of introversion and extroversion are trait specific and become static after a certain age. Regardless of your type, one of the features hallmark of introverts is not being shut-ins or less sociable, but rather that the relationships they do have with people tend to be a lot deeper. Extroverts, on the other hand are more prone to interacting with a wider spectrum of people, but their interactions tend to be more shallow/surface as compared to introverts. One is no better than the other, only different; apples and oranges as they say.