Actually I don't think I'm the most approachable person, but I think most of it is my introversion. Even while at work...I might have a few days where I'm totally in my head and I make very little contact with people around me, and I don't really initiate anything. I'm just...completely in my head. :-) Sometimes it's my mood, and I'm in a negative mood so I don't want to be around people. But other times I'm in a fine mood, I'm just wrapped up in my thoughts. I really think my ISFJ coworker/friend is perplexed by this and she sometimes approaches me with trepidation and caution. Late last week I was completely in my dreamworld/thoughtworld, and she approached me on day 2 of it and asked cautiously...'Are you ok? I thought something might be wrong??'...and I was surprised - I was like, 'Oh, I'm totally fine!! Sometimes I totally just become oblivious to everything and everyone around me!! It's not you!! :-)' Then I'll realize maybe I should go talk to her or others more often so they don't think I'm upset/mad with them!! :-)
Ok..that anecdote aside..I still don't think I come across to most people as being fluffy. I'm not overly warm, I'm not charismatic and effervescent, I'm not 'fluffy' in the bubbly/goofy/huggy sense. I keep most of my emotions under the surface, but I don't think I can hide them, really. They just don't have free reign in how I respond to people. I imagine some people might think I was a T if they met me in person and I wasn't talking about myself and my own processes/thoughts/feelings at all (and also, I think a lot of people associate 'F' with more of your extroverted feelers, and how the Fe/Fi displays with an extrovert. Introverted feelers are going to appear differently).
Oh, and driving -- hahaha -- I'll often mutter 'Dumbass' under my breath when I'm driving around town and I get annoyed with various drivers. :-)