I'm seeing ENFP. It would make sense that you feel you are introverted. Being an Extrovert does not mean that you are energized by people, per se. We are all energized by using our dominant Function, and using our lower functions is draining for us. Social interaction is only one element of the external world, and the ENFP is energized by interfacing with the possibilities and patterns of the external world, Ne if you will. However, as people sometimes find their behavior to be too bouncy and off the wall, they start using their lower and more draining cognitive functions such as Si and Te to modulate their Ne and Fi when dealing with people. This dynamic gives the appearance of being drained by people, and thus being an introvert. It is also not necessary to be around people to stimulate your Ne, in fact you could be in your Ne simply by reading a book or by going on a hike alone. Your thoughts?
Hope you don't mind me adding my thoughts here.