How a person reacts in a certain situation has a great deal to do with if the person is an introvert or an extrovert. Extroverts are more outgoing, sociable, and enjoy working with others. Introverts usually like to be by themselves, are less sociable, and usually try to avoid confrontation.
My friend is an introvert and she has a hard time working in groups, and would prefer to take classes with people she knows. She does not enjoy meeting new people, and she tries to avoid confrontation and awkward moments at all costs. She rarely ever complains and doesn't like drawing extra attention to herself. Unlike my friend, I'm an extrovert and behave very differently than her. When we are together I'm usually the one to speak up in situations, while she is hushing me in the background. I also don't have a problem socializing with people or getting to know new people. I find it very interesting to see the differences between our personalities, and the way we behave when placed in certain situations.
Below is a test you can take to see whether you are an extrovert or introvert.