I'm not an introvert because, while I do somewhat limit my contact with other people, I'm not preoccupied with my own thoughts and feelings.
I'm not an extrovert because, while I'm somewhat outgoing with other people, I'm not overtly expressive nor gregarious.
I'm not an ambivert because I'm neither introvert nor extrovert nor in between.
So you would think I'm an antivert but that's a drug that reduces vomiting.
So I guess I'm just me. I'm comfortable with that.