If you've devoted time to investigating INFJ & INFP and you can't really tell what the difference is, or you just can't make up your mind which one you are and keep waffling back and forth -- the simple truth is that your preferences are probably for INFP.
(That does not mean that irrationally locking on to a decision that your preferences are for INFJ will make you one! In fact, whenever I encounter that mindset, I figure I'm talking to an INFP who has made a feeling *decision* about what type preferences they want to have, and they're not willing to discuss it. People who have discovered their best-fit pattern are usually delighted to talk about the evidence that supports their choice.)
