This thread really is like a leap of faith. You're either saying something that only applies to you (and makes you seem like a nut) or something that seriously applies to INFJ's. It's like a tossup.
(I believe) you know you're an INFJ when...
Depending on what the situation is, you're either a world class liar or absolutely pathetic
You beat yourself over the head after thinking back on conversations/social interactions, worrying you said something that you feel didn't represent what you were trying to say or gave off a bad impression of you.
You often feel like you never have enough time to get a grip on all of the thoughts and ideas bouncing around in your head.
Your inner life is unbelievably rich and vibrant, and is similar to the outer life of an ENFP: Playful, colorful, mischievous, and daring.
You feel like you're too weird and out there for most people to accept you for who you really are. You keep in mind that there are people who'll love you for you out there somewhere, but there have been so many times where that wasn't the case AT ALL so you feel it's almost impossible.
When you're a wreck, you're a wreck.
When you gladly accept people for who they are, but you almost kill yourself inwardly trying to keep up with your perfectionistic ideals.
You poop in public.