I was very much ENP. Though IFP fits to a lesser degree, I was not really all that sensitive. I was at times and could get frustrated very easily and was rather consistently anxious (the latter deals with GAD, which I believe I developed at a very early age). Thinking of the way the IFPs I have gotten to know have demonstrated sensitivity (albeit not in childhood), it's clear to me that mine is not on the same level.
For me, I stared life being very social and talkative. Then, I just sort of shut down at about the time I entered puberty. I think it had to do with being rejected by my peers and others frequently. I'm pretty sure I unconsciously saw Ne as a bad thing.
In my late teens, I opened up a bit more. I would call myself an extrovert in the end, but a withdrawn one. My extroversion lies more in the realm of ideas and possibilities in the external world. I'm pretty easy going and friendly, but I do think there is a more reserved, contemplative side. A friend of mine who believes in reincarnation says that I am an old soul. I think that if reincarnation is real, I likely have been around for a very long time.