You know two versions of this. Maybe you’ve been both.
There’s a stretch of your life where everything kept building. A conversation turned into a connection, the connection turned into an opportunity, the opportunity gave you enough confidence to try the next thing. It felt like momentum because it was.
And there’s been a stretch where everything stalled. One disappointment bled into the next.
You didn’t try for the apartment, so you stayed in the situation that drained you, which made you less available for the friendship that might’ve helped, which confirmed the thing you already believed: that things don’t tend to go your way.
Psychology has spent decades studying the distance between those two stretches. Most of what they’ve found starts earlier than you’d think.
The first domino is a sentence you say to yourself
It starts before anything happens. A quiet line you run past yourself without stopping: “This probably won’t work.” It’s realistic. Sometimes it is. But when it runs on repeat, it does more than predict the outcome. It starts to shape what you notice.
You skip the party because you assume nobody wants to talk to you. You don’t apply for the lease because you figure the landlord will pick someone else. You don’t text back because the friendship already feels like it’s slipping.
Each decision is small. Each one is also a data point you’ll use later to explain why nothing panned out.
Psychologist Dan Tomasulo at Columbia University, writing about expectations and perception, describes how this loop runs: “Our expectation of what’s to come does the job of interpreting the world for us. Our reaction then loops into a confirmation bias. This means we will experience the world as expected.”
The proof isn’t invented. It’s curated. You walked past thirty neutral moments and three bad ones, and your brain circled the bad ones in red. By the end of the week, you have a case file. And every entry in it is real.
That’s what makes this so hard to see from the inside. You’re not wrong about the evidence. You’re wrong about the sample.
You expected it to work out, and that changed what you did next
You signed up for the class even though you weren’t sure you’d be good at it. Met someone there. That person mentioned a listing for an apartment in their building. You applied. Got it.
Told a friend about the move, and the friend mentioned a job opening two blocks away.
None of that was fate. All of it required showing up, and you showed up because the expected outcome made the risk feel survivable.
“This could work” is a low bar, but it’s enough to get you through the door. “This probably won’t” keeps you on the other side of it.
Psychologist Juliana Breines, on belief and behavior, explains why the effect isn’t only internal. People who overestimate their own abilities tend to come across as more socially skilled, even to evaluators with access to their real performance.
And the reach goes further: your expectations can shift how other people respond to you.
You walk into the room expecting to belong, and something in your posture, your eye contact, your willingness to stay in the conversation a beat longer communicates that.
The room picks it up. You didn’t perform confidence. You stopped bracing for rejection, and that absence changed the whole interaction.
The belief leaked. And the environment responded to it.
More Bolde Stories
The filter runs across everything
This is where the two versions of your life stop looking like two moods and start looking like two trajectories.
The version of you that decided it won’t work out applies for fewer jobs, goes on fewer dates, declines more invitations, drops more hobbies after one rough session.
The one that decided it will sends more emails, says yes more often, stays in conversations longer, tries the thing a second time after the first attempt didn’t go well.
One of them collected ten moments that say “things tend to work out.” The other collected ten moments that say “they don’t.” Both are telling the truth about what happened. Neither one sees the filter that shaped the collection.
Six months of “this probably won’t work” costs you forty conversations you never started, a dozen invitations you turned down, and a life that looks exactly the way you predicted it would. The prediction was the cause.
This isn’t a poster on a dorm room wall
This is where the distinction matters. Deciding things will work out is not the same as visualizing a parking spot or journaling your way to a promotion. It isn’t manifestation. It isn’t cosmic ordering.
Science writer David Robson, in a piece on expectation effects, draws the line clearly: the expectations that change outcomes are specific beliefs about particular challenges, not “an undefined optimism about life in general.”
A study from Stanford’s Mind and Body Lab makes the mechanism visible. Participants took a real genetic test, then received randomly assigned feedback telling them they carried a variant that made exercise harder.
Their bodies responded to the label: lower stamina, more discomfort, measurable changes in lung function. What they believed about their DNA shaped their physiology more than the gene itself did.
Beliefs set what the brain treats as important. That priority changes what you notice, what you attempt, and how your body responds to the attempt.
The result feeds back into the belief. The loop is mechanical, not magical. And it runs whether you’re aware of it or not.
The belief doesn’t prevent the loss; it changes the next move
Life still goes sideways. The interview goes badly. The relationship ends. The plan you were counting on falls through on a Wednesday afternoon.
What shifts is what happens after. You treat the loss as an interruption, or you treat it as the whole story. You update the narrative with new information, or you add the loss to a file that’s been open since you were seventeen.
Both got knocked down. One of them decided the fall was evidence. The other decided it was a chapter. And the next morning, only one of them tried again.
