Interesting! I don't know. I just read up on differences between P and J to see if I was missing anything, and I still think there's no way I could be a P! There were some aspects I related to, but for the most part P traits are the things that drive me nuts. I've always been very J, just life has taught me I need to mellow out a bit and relinquish "control".
As for introversion/extraversion i am closer to the line but i do think i lean more towards extraversion.
I've been told I'm really hard to type though. I very strongly identify with the ENFJ profile. It describes how I relate and deal with others extremely well.