Where to start.
Short version: INTJ>INTP>INtP>INfP 
Longer version:
Met INFJ at 26. Changed my life. "Saved me from myself"
3yrs+ later INTP T80%~ to T1%... indentity crisis followed.
Two weeks on INTPforums, and end up realising I'm actually an INFP. Kinda happy about that, slightly scared though...
BECAUSE
I spent my entire life til 26, FROM CHILDHOOD savagely supressing Fi & developed T(e). 
Now at 29, I'm here on an INFP forum, fresh from INTPforum after discovering I was INFP 2 days ago. 
This is going to be interesting for me to say the least.
I am big on personal growth, so it's something i'm going to embrace even more than I usually do, because finding out i've lived 29 years of my life as my INFP weakest function T(e) instead of the surpressed Fi (strongest), it feels like this is going to be a big positive change that i've been searching for my whole life.  
Since I do have a developed T(e) and undeveloped Fi right now, If i'm being offensive, please do tell me. 
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^^^^ LOL! This is embarressing, but i'm gonna leave it up, because it's funny. 
I realise today after reading a little too much, and thinking more than I have in a while, I'm actually an ENTJ/ENFP,  one that ever so slowly got depressed a few years ago, snowballed and ended up with a hell of a lot more problems. (well many of them will die tonight) 
On the bright side, I'm less of an asshole than I was before, that's always a plus? xD
UK