I read about narcissism at 1am and recognised myself
Diagnostic criteria are written broadly and read personally. Most people find themselves in them. The recognising is a compulsion in its own right, and one of the first we take out.

It is one in the morning and you are reading about narcissistic personality disorder. Grandiosity: well, you do sometimes think you are good at things. Need for admiration: you did enjoy being thanked. Lack of empathy: you were not sure what you felt at the funeral. Nine criteria, and you can find yourself in every one. Then a page says that worrying about being a narcissist is a sign you are not one, and you feel relief, and then you wonder whether you only felt relief because you wanted to let yourself off.
I want to take this apart, because the reading is one of the central compulsions in identity OCD and it feels like research.
Criteria are written broadly and read personally
Diagnostic criteria are designed to cover a wide range of people. They are written in general terms, because they have to be, and they describe traits that exist on a spectrum in everyone. Almost every human being sometimes thinks well of themselves, enjoys being appreciated, and has moments of not feeling what they expected to feel. Read the criteria for almost any condition with the question "could this be me?" and the answer will be yes, because the criteria are broad and the question is loaded.
This is why self-diagnosis at one in the morning is such reliably bad evidence. You are not reading neutrally. You are reading with a fear, searching for a match, and a search conducted that way always finds one.
Why the reassuring line does not hold
Somewhere in your reading you will have found the line that says a real narcissist would not worry about it. It is roughly true. Relief for a moment. Then the doubt finds the gap: but what if I am the exception, what if my worrying is itself a performance, what if I only read that line because I wanted to. Reassurance always expires. Then you go back to the criteria and start again.
The reading cannot settle the question, because the question is not the kind that reading settles. Character is a pattern of what you do, visible from outside and permanently unavailable to introspection, rather than a fact stored somewhere inside you that the right article will reveal.
The recognising is the compulsion
Reading the criteria is a compulsion, functionally identical to checking a lock or scanning your body. A doubt arrives: what if I am one? The doubt is unbearable. You go to check, in this case by reading. The check produces an ambiguous result, because every criterion fits and does not fit. The ambiguity produces more doubt, and you read again. Each round teaches your brain that the question was worth this much attention, and the next round arrives sooner.
This is why, in CBT with exposure and response prevention for this theme, the reading is one of the first compulsions we take out. We do not wait until you feel better, because it is feeding everything else.
What you would find instead
If you stopped reading and looked at the record instead, the one visible to other people, you would usually find something rather ordinary and rather reassuring: a person who is kind sometimes and irritable sometimes, who enjoys being appreciated and also does things nobody sees, who felt less than expected at one funeral and more than expected at another. The people others have concerns about are not the ones auditing themselves at one in the morning.
What I will not do
I will not tell you whether you are a narcissist. I can tell you that people with this theme ask, and that answering it is the single most tempting mistake available to a therapist here. Answering would last an afternoon and make the next round harder. What we can do properly is work out whether this is OCD, which is a question with a usable answer and a treatment attached.
What treatment does
We map the cycle and take the compulsions out gradually, by agreement: the reading, the motive-checking, the replaying, the emotional temperature-taking, the reassurance-seeking. Inference-based CBT works particularly well here, because the evidence is almost entirely a chain of reasoning stacked on top of a life whose actual record does not support it. The aim is for the question to stop being asked at that volume.
If the search history on your phone is full of personality disorders, there is more on how I treat identity OCD, and closing the tab is where we start.