Let's look for a second at MBTI - left to my own devices in low-stress situations, I'm a laid back IXTP. But under significant stress, inferior Fe makes me ashamed that I let down myself and others. If it's truly my fault, then people have every right to be outwardly angry with me, and I alone must bear the weight of their anger and my shame. Usually it's for not being diligent like a good little XSTJ. My shadow functions manifest in my... I don't know if it's an alter ego or imaginary friend, but his name is Kimmit, and he's my abusive super-ego telling me how much I suck. I'm sure he was either ESTJ or ENFP (in the worst way - the "It's your fault you have autism" kind of way). He formed when I was 2 or 3, probably out of all the times I had asked for something and had been denied it. His catchphrase was "No, you don't need it." Kimmit the image faded but the sentiment remained as I went through school - the American public school system seems to cater to SJ, particularly STJs, and then NTs are stereotypical "prodigies". SP's are so disruptive and spend so much time with their heads elsewhere that they make drugs specifically to drag us back to the present so that we can do the things like good little SJs in the name of mental health. (Disclaimer: I get it, some people really do have attention deficit problems. I'm ranting about the system dismissing different ways of learning and interacting with the world as a disorder that must be corrected. A difference I should be able to overcome by myself because I'm smart but struggle with because I process things differently. Ugh.)
Because I'm smart, I'm supposed to be able to do everything an STJ does successfully, and since I'm a T-type, that means I have to simultaneously be a genius NT. I'll be the one to cure cancer, but only if I can do the things and submit the history paper on time. And if I can't/don't, then I'm a failure in the system. And if I'm a failure, then people will express disappointment that all my talents are being wasted because I won't write a paper. If only me. Blame is internalized and turns into anger.
I'm angry because I can't be the good little ISTJ everyone wants me to be. I'm angry because I have no interest in writing the papers, preferring instead to draw or watch YouTube videos or read medical case reports. Then Kimmit the sentiment shows up and rubs shameful Fi in my face. But how dare I express it.
Inferior Fe tends to play a role.
For example, my grandparents (both sets) burn through my patience reserves like one of those cars from the 60s that got like 8mpg. This has gotten to the point where have drafted a contract that forces me into a horrid mix of an ESFJ and an ISTJ. Fe-Si: be nice and polite, even if superficially, and host their every whim. If you have a hard time faking it, call on ISTJ - do your duty like a good little ISTJ and make sure fake-tert-Fi squashes down any resentment until you can burn it off alone in your room with the door locked (but only as long as there's no risk of someone walking in because how dare you hint that there's something wrong).
If my grandfather wants me to turn on the tv or show him how to change the channel, don't I dare slam my laptop shut.
My unhealthy-ESFJ grandmother wants to tell me for the umpteen billionth time all about how she wouldn't dare leave her house unless her hair was perfect and her clothes had not even a single wrinkle and how all the popular boys wanted to date her, shut the laptop nicely, sit, listen, give her my full attention, pretend there's a listening quiz on her speech.
Do not slam phones/laptops/doors/silverware. Look lively. Do the things. Shame if you fail.
My mother is a common source of anger. I went to church by myself today. This requires me to drive about 30 miles each way (20 on the interstate). You know, instead of just going to one of the local ones that are literally walking distance from my dorm. Anyway, I keep my cell phone ringer on in case she calls me in a panic or something, which has happened. Today she texted me while she knew I'd still be driving (I read it at a really long red light when I got off the interstate), and I felt like slamming my phone on the dash and throwing it out the window. I texted her back when I arrived at the place but it didn't stop me from seething. It took donuts and an hour-long sermon to cool off.
I've been known to reply to her "Are you driving?" texts with "I hope you weren't actually expecting me to answer this right when you texted me." when I got where I was going.
That's as snappy as I can comfortably let myself be. She's my mother. She brought me into this world and she can take me out. And all those other clichés.
Anyway, the moment my anger starts leaking out of my stone composure (i.e. I say something wrong or I shut my laptop a smidge harder than usual), I get berated. One time when I was in elementary school, I slammed my door because I was mad at someone, don't remember why, and my parents literally dragged me out of the room and we had "door-closing lessons." I have never wanted to stab something more than I did then. It was like, JUST LET ME BE ANGRY AND BLOW OFF STEAM. I'M NOT THE TYPE TO THROW TANTRUMS AND YOU KNOW IT. JUST LEAVE ME ALONE. Anyway they threatened to remove my door if I did it again. I never (intentionally) did it again. They laugh when they tell that story.
My roommate works and sleeps at all the weird hours. Like, she goes to class but then comes back and sleeps until I decide I'm going to bed, and then she gets up and practically attacks her keyboard, and it's almost misophonia how much I can't stand it and can't sleep through it (I've tried earplugs, they're too umcomfortable and the sound filters through anyway). I cry when I'm really
really angry, and I've cried over her doing this. I wanted to throw her laptop out of our third-story window. But I can't let her know. She needs to do her homework more than I need to express my anger. Or sleep. All I can allow myself to do is calmly ask her to do her homework either at another place or at another time. What irks me? She claims she has no problem sleeping through my manic nighttime typing. This is a contradiction for me. Golden rule. I don't want her typing while I'm trying to sleep. By that logic, I shouldn't type while she's trying to sleep. And I should let her sleep when she wants. I could go do homework elsewhere. But then tert Ni (let's assume I'm ISTP) smushes Se-aux (a frequent occurence I'm afraid) and says it's too much work, and shadow Si (bodily awareness?) reminds Ti-dom that I need sleep too.
My dad does this too, though his excuse is that his circadian rhythm is totally messed up by his chronic illness and lack of a routine (which he wouldn't have the physical energy to keep up anyway).
This is what my super-ego does. As soon as I get angry at someone personally, they justifies the other person's POV. Golden rule. "I wouldn't want my roommate telling me I can't do homework because it keeps her awake." "I'd be just as worried if it were my own child driving on a big scary interstate highway by herself." How dare I condemn the opposite party for their
good intentions and for their needs which clearly outweigh mine. My super-ego feeds all this to Fe and I'm not allowed to be angry, yet I am. Cue more shame.
Thought: My mother is INFP. Kimmit shares all of her functions, even if they're not in the same order. So Kimmit is basically an exaggerated shadow version of my mother.
It's even more annoying to me and my internal framework when someone tells me I'm allowed to get angry at stuff. Um. No I'm not? Because as soon as I get visibly angry those same people are like "no no no don't be mad."

WHICH ONE IS IT?