Loneliness is usually pictured as being by yourself. But psychologists are paying closer attention to a different kind, the kind that can happen at a packed lunch table, in a busy group chat, or even at a loud party where you are laughing on cue. Psychologist Elizabeth C. Pinel at the University of Vermont describes this feeling as “existential isolation,” when you feel alone in your experience of reality even when people are right there with you.
That idea hit a nerve in February 2026, when writer Justin Brown shared a story about a business dinner in Singapore and a colleague who seemed socially effortless. Mid-conversation, the colleague leaned in and quietly admitted, “I’ve been doing this version of myself for so long I don’t think I remember what the original one sounds like.” Brown argued that this hidden disconnection can be more corrosive than being physically alone, because it looks like a normal social life from the outside.
Loneliness that does not look like loneliness
Researchers increasingly separate “having people around” from “feeling understood.” A 2019 paper about the State Trait Existential Isolation Model described existential isolation as the sense that you are alone in your experience and that other people cannot understand your perspective, even if you are not socially isolated. It also suggested this can show up as a short-lived state in certain moments, or as a more stable trait that follows someone through daily life.
This is part of why the feeling can be so confusing. You might be popular, busy, and invited, yet still feel like you are watching your own life through glass. And when you try to explain it, it can sound ungrateful, which pushes some people to stay quiet.
Have you ever gone home after a “good” hangout and felt strangely empty anyway? That gap is the story here. It is less about the number of friends in your contacts and more about whether anyone is connecting with the real you.
The Sunday self vs the public self
One simple way to think about it is the “Sunday afternoon” version of yourself. That is the you in an old T-shirt, making coffee the same way every time, rewatching a comfort show, and finally not performing for anyone. If the people who say they know you would not recognize that person, the disconnect can start to feel like loneliness with an audience.
Of course, everyone adapts a little. You act differently with teachers than with close friends, and differently at work than at home. The problem is when the gap gets so wide that the public version becomes a full-time role, and the private version starts to feel like a stranger.
That is where everyday social life can turn into emotional labor. You are not just talking, you are managing reactions, editing your stories, and staying on script. For some people, the social calendar stays full, but the sense of being known keeps shrinking.
Self-concealment and the hidden mental load
Psychologists have studied a related habit called “self-concealment,” which goes beyond normal privacy. In 1990, Dale G. Larson at Santa Clara University and Robert L. Chastain at Stanford University described self-concealment as actively hiding personal information you see as distressing or negative, and they created a scale to measure it. In their study of 306 people, higher self-concealment was linked with more self-reported anxiety, depression, and physical symptoms, even after accounting for factors like trauma history, social support, and general self-disclosure.
The important point is not just “having secrets.” It is the constant effort of maintaining two versions of yourself, which can chew up attention the way a phone app drains battery in the background. That is why someone can look confident at school or at work, then feel completely wiped out when the door finally closes.
A bigger review in 2015 looked across 137 studies that used the self-concealment scale in many different groups, from adolescents to international samples. The authors argued that self-concealment often involves a push-pull conflict between wanting to hide and wanting to be understood, which helps explain why it can be so mentally exhausting.
A new way to measure the feeling
One reason existential isolation took longer to study is that it is hard to measure something so private. In 2017, researchers published a paper introducing the Existential Isolation Scale, a short set of questions designed to capture whether someone feels alone in their subjective experience. The paper reported that the scale was distinct from measures of interpersonal isolation, stayed fairly stable over about two weeks, and could also shift when people were deliberately prompted to think about being misunderstood.
That kind of work matters because it turns a vague feeling into something researchers can test. It is not perfect, since it relies on self-report, but it lets scientists compare patterns across groups and look for what predicts the experience. In practical terms, it is a first step toward figuring out why some people feel unseen in almost any room they walk into.
A separate study published in 2022 looked at how existential isolation can interfere with “belief validation,” the basic human need to feel that other people confirm your view of reality. The researchers tested the idea that feeling alone in your experiences makes it harder to share reality with others in a way that feels truly grounding.
Health stakes beyond emotions
This topic is not just about mood. In May 2023, the U.S. Surgeon General warned that loneliness and social isolation are linked with serious health risks, including higher risk of premature death, and the advisory compared lacking social connection to smoking up to 15 cigarettes a day. The same report highlighted that loneliness and social isolation were associated with increased risk of heart disease and stroke, along with mental health concerns like anxiety and depression.
Existential isolation fits into that larger picture in a specific way. Someone may not be isolated on paper, yet still feel chronically disconnected in the place that counts most, their inner experience. Over time, that can shape how they trust people, how they handle stress, and whether they ask for help when life gets heavy.
Health agencies outside the United States have also started framing social connection as a public health issue. In June 2025, the World Health Organization pointed to evidence linking stronger social connection with better health outcomes and lower risk of early death, while warning that loneliness and social isolation are tied to both physical disease and mental health problems.
What connection can look like in real life
So what actually reduces existential isolation? One clue comes from research on “I-sharing,” which focuses on moments when two people feel they are having the same immediate experience, like laughing at the exact same beat or reacting the same way to a surprising moment. A 2006 paper described I-sharing as a pathway to connectedness because it temporarily shrinks the feeling that your inner world is unshareable.
This can sound abstract until you picture it in real life. It might be the friend who gets why a certain song hits hard without you explaining your whole backstory, or the classmate who notices you are quieter than usual and does not force a performance out of you. Small moments, but they add up, and they can feel more real than a hundred polite conversations.
None of this is a call to overshare or erase boundaries. Privacy can be healthy, and not every relationship is built for deep disclosure. But if someone is constantly performing and regularly feels unseen, the research suggests the pattern is worth noticing, because loneliness is not only about being alone, it is also about being unknown.
The main study has been published in Personality and Individual Differences.
