I'm either a 4w5 or 5w4. My highest function scores are Ni, Ne, Ti, and Fi. They are all at the high end of the spectrum, so my only extroverted function that makes a real showing is Ne. My Fe is moderately low on scores and in descriptions I'd have to say I don't have the regular sort of Fe. What Fe is to me is the ability to internalize emotions and thoughts from people outside myself. It isn't keeping track of social niceties, rules, and social structures or hierarchies. I'm lost with those skills and cope socially by smiling at people and not saying much besides a few compliments, listening to them and especially avoiding rude statements. I have a strong external component for empathy and responding to external emotional cues, but it is based on one individual at a time. Groups overwhelm me with too many emotional/cognitive cues so much that I had to quit teaching in a classroom setting and find employment where I could work with one at a time.
Parts of the E4 fit with me, and technically I might actually fit the category of "highly sensitive personality type", but I don't want that as my identity because even though I have heightened reactions to things, I feel I am tougher than average because of it. I take a medication to quiet nerve function because I tend to have chronic pain and anxiety, and I know I don't fit the "norm" for thinking and behavior, but I'm not sure how to describe what it is. My world is primarily internal, but it is a big world because I internalize everything I encounter, so it isn't like I just ignore or reject the external world and the people in it, but just have to process it inside in order to make sense of it.
Edit: this may be TMI, but I was recently having a conversation with an individual in the creative arts (well established and brought in to present) and he said that I seemed extremely inward like I was solely in my mind. He asked if I had a deeply subjective experience that influenced my work and thinking because he noticed something about my face being highly expressive. He also said I was "strange", but he meant it as a compliment and English was not his first language. He was an elderly man and extremely intuitive. It embarrassed me a little because it felt like my cover was blown. I think most people see me in a very conventional way because I am so quiet and don't try to shock or confuse, so it was a surprising feeling to have someone see through it and verbalize it to me.