I have never fallen into solely introversion and extroversion. I am an introvert at times, and it depends on the context of the social situations at hand. Like when my stepfather's children are over, I find myself highly avoidant of socializing and preferring to be by myself. With most family social events, I tend to avoid it whether that's visiting or watching movies at home. I think it's because my family is fairly big and I don't like spending time with everyone all at once. When I have solo time with people, I am an extrovert. If I'm hanging out with two people who are familiar with me, I'm an extrovert. Hanging out with people I consider what this "fp" terminology falls into, I'm an extrovert and prefer to hang out only with them if that makes sense. It also can depend on my mood a lot. I just notice I become introverted when everyone is over. It just gets me in this irritable and angry mood and I suddenly despise socializing. I want to hide in my room and be alone. It just gets draining to feel the need to entertain everyone all at once. I'm just not that sort of person. My moods just spiral into this angry, easily annoyed, antisocial person. Everyone in the house drives me crazy. My energy feels drained by them. I think I need balance in how many people I'm around. 

I mean, my stepfather's family are healthier than my own biological dad's. Yet around these healthy people, I can't function. I got out of a toxic family situation with my dad and live at my stepfather's place with my mom and can't seem to click with anyone. Is it trust issues from this past? I just don't know what to call it along the lines of social behavior...because I'm not an introvert fully or an extrovert around them or in general.