The two words get used interchangeably in ordinary speech and they describe states that behave in almost opposite ways. That would be a pedantic distinction if it did not have a practical consequence, but it does, and the consequence is large: one of these reliably produces repair and the other reliably produces avoidance, including avoidance of the person you wronged.
June Tangney's research programme is the usual reference here, and the finding that matters is counterintuitive. The more painful feeling is the less useful one. Shame hurts more, lasts longer, and predicts worse outcomes — more defensiveness, more blaming, more withdrawal, and a higher chance of doing the same thing again.
How to tell them apart
Find the subject of the sentence. Underneath guilt there is a verb: I said something dismissive. Underneath shame there is an adjective attached to you: I am a dismissive person. Same incident, two grammars, and the grammar decides what happens next. A verb can be addressed. An adjective can only be concealed.
Watch what you want to do. Guilt produces an impulse towards the other person — apologise, fix it, make it up somehow. Shame produces an impulse away from everyone: cancel, go quiet, get small, or, very commonly, get aggressive, because attacking outward is one of the fastest ways to stop feeling exposed. If the strongest urge is to disappear or to defend, that is the shame one.
Check whether anyone is watching. Guilt works perfectly well alone in a room; it is about the act and the person harmed. Shame needs an audience, even an imagined one, and it comes with a felt sense of being looked at. The involuntary physical script — the face, the eyes going down, the wish to be smaller — belongs to shame and is remarkably consistent across cultures.
Ask what forgiveness does to it. If the person you wronged says it is fine and you feel meaningfully lighter, that was guilt and it has been discharged. If they say it is fine and something in you does not accept it — because the problem was never the act — that is the other one, and no amount of reassurance from them will close it, which is exhausting for both of you.
Time it. Guilt has a natural end: repair, or an honest impossibility of repair, and it fades. Shame has no endpoint built in, because there is no action that addresses what you are. A feeling that is still fully present six months after an apology was accepted has told you which one it is.
What to do
- Rewrite the sentence with a verb in it. Literally, on paper. Convert I am selfish into the specific thing you did and to whom. This is not a wording trick — it is the move that restores the possibility of action, and the action is what ends the state.
- Do the repair small and soon. A specific, short apology naming the actual thing, without a paragraph of self-description attached. Apologies that are mostly about how terrible the apologiser feels put the other person in the position of comforting them, which is a second imposition.
- Notice when it is standing in for something. A lot of what people call guilt is closer to anxiety about someone's disapproval, and a lot of what they call shame is a verdict delivered by an inner critic rather than anything they did. Those need different responses and only one of them needs an apology.
- Say it out loud once to somebody safe. Shame is unusual among emotional states in that concealment is part of its maintenance — the mechanism runs on not being seen, and telling one person who does not recoil takes a measurable amount of the charge off.
- And separate guilt that is accurate from guilt that is chronic. Feeling bad about something you did to someone is functioning correctly. Feeling continuously responsible for other people's states, including ones you had no part in, is closer to a boundary problem and it does not respond to more apologising.
What it depends on
Which of the two you default to is fairly stable, and what varies most between people is the specific word their shame uses. For one person it is needy, for another stupid, for another cold, boring, or too much — and an astonishing proportion of a life can be arranged around not being whichever one it is. Knowing the word does more than any general instruction about self-compassion, because it tells you which situations will be disproportionately expensive and why.
The enneagram is the framework that takes that idea most seriously, organising nine types around what each is trying not to be. It is a typology rather than a measurement and we label it that way, but as a source of a vocabulary for this specific question it earns its place. If the voice delivering the verdict is the thing you notice most, the critic and the shadow are not the same object and the distinction saves time. And if the state arrives without any word attached at all, naming it is a separate skill and worth building first.