Do you know where you fall on the introvert-extrovert spectrum? Are you oriented more towards the outer world or the inner world? Do you get more energy when you are around people or by yourself?
The more preference you have towards stimulating environment the more extroverted you are and vice versa.
Whether you fall in the extrovert or introvert category (or somewhere between), it can have a significant influence on your career choice, relationships and overall lifestyle.
One type isn't "better" than the other. Each tendency can have benefits and drawbacks depending on the situation. By better understanding your personality, however, you can learn how to play to your strengths.