Energy Manipulation is the basis and foundation of whether a person is an extrovert or an introvert.
Basically you have a pool of your own energy/spiritual life force/soul. Other people have the same. People then have a particular way of engaging with others unconsciously on this kind of spiritual level.
The term "extroverts" shouldn't actually exist when you look at what's going on behind the scenes. It's actually an occurrence -and one that can be changed if a person chooses. An "Extroverted" Situation arises when a person takes, drains, or harnesses energy from other people. They do this by drawing in attention to themselves -often by speaking and making themselves known in front of others. A person who does this for extended periods of time can then leave people feeling drained, or make them feel like time has been wasted.
An "Introverted" Situation is one in which a person's energy tends to get drained by others. If that person were to speak in front of people they would "give" of their own energy and soul and that energy would then be "taken" by the audience. They would feel overwhelmed by the energy of others and they would instinctually have tendency to preserve themselves by hiding/, avoiding social situations, and not speaking.
The way to shift these situations -especially if you are prone to one arising frequently - is to find the balance between them by Maintaining Your Own Energy and being Conscious and Respectful to Other People's Energy. It's kind of like saying, "This is MY Kingdom. That is YOUR Kingdom. I will not invade your kingdom, but I will maintain my own and remain strong, resilient in my presence.