I know I'm an NF. The introvert/extrovert and judging/perceiving parts are more difficult to determine.
In order to feel safe in the world, I have acted pretty extroverted. I have to make sure no one is going to abandon me (I have BPD), and I learned how to make people feel good to feel safe. I've been accused of not being the "hanging out" type by my peers. This confuses them since I act friendly and interested. I do seem to need to talk out loud in order to process things, but I am ashamed of this aspect of my personality as I feel like I take up other's time/energy too much. I have little to say to people, unless we are connecting about feelings and they need empathy.
I am very disorganized and I did poorly in school. I'm very clumsy, I procrastinate a lot and I work well under pressure. I can also be pretty random. From what I've understood in reading about "P" the previous qualities fit. Being on time and being responsible is important to me, and I feel guilty/self disappointed if I am unable to meet my own standards (or perceived standards of others). I need to follow the rules. I re-read emails/messages several times before posting. This strikes me as being "J"
As someone with BPD, my personality can change depending on who I'm with in order to feel safe. Perhaps I need to heal the BPD before I can learn my true personality? Any thoughts/opinions are welcome and appreciated. Thanks