The short answer
It’s hard because adult life takes away what used to make friendship automatic: unplanned time, the same faces every day, and places where meeting people was built in. On top of that, people consistently underestimate how much others like them, so they hold back just when they should follow up. Most of this is circumstances, not your personality. Here are the reasons, with the research behind each one, and what to do about it.
1. Friendship takes hours, and adults have fewer of them
Jeffrey Hall at the University of Kansas estimated it takes about 50 hours together to become casual friends, about 90 hours to become friends, and more than 200 hours to become close friends. The kind of time matters too. Hanging out counted toward friendship. Hours spent working side by side counted less.
Most adults aren’t getting those hours. According to the US Bureau of Labor Statistics’ American Time Use Survey, 30% of people spent any time socializing and communicating on an average day in 2025, down from 38% in 2015. Time spent on it fell from 41 minutes to 35. At school, 50 hours with someone happened in a few weeks without trying. As an adult, you have to schedule every one of them.
2. Your network peaked around 25
In a study of phone records from 3.2 million people in one European country, published in Royal Society Open Science, the number of people someone was in contact with peaked at around age 25 and declined after that. That was just one country and one year (2007), and it tracked phone calls, not friendships. But it matches what most people notice: in your mid-twenties, your circle stops growing on its own.
None of this means something is wrong with you. Your social life just stopped growing by default.
3. The places that made friends for you are gone
In the 2021 American Perspectives Survey, Americans with close friends most often met them at work (54%), at school (47%), through friends they already had (40%), or in their neighborhood (35%). Only 8% met a close friend online. School ends. Remote work shrinks the office. Moving away cuts you off from your old network and your old neighborhood.
The report’s authors also point to larger trends: people marrying later and moving more, parents spending about twice as much time with their kids as earlier generations did, and longer work hours with more travel. Each of these makes sense on its own. Together, they leave little room for anyone new.
4. You think people like you less than they do
Psychologists Erica Boothby, Gus Cooney, Margaret Clark and Gillian Sandstrom had strangers talk for a few minutes, then asked each how much they liked their partner and how much they thought their partner liked them. People consistently underestimated how much they were liked. The researchers called this the liking gap, and among college roommates it lasted for months. Video showed that people missed their partners’ signs of interest. As Clark put it, they were ‘too wrapped up in their own worries.’
This is why adult friendships often stall after one good conversation. Both people come away unsure, so nobody follows up.
5. Everyone is waiting for someone else to ask
Add the first four reasons together and you get a common pattern. Two adults like each other, both are busy, neither is sure the other is interested, and each is waiting for the other to suggest a plan. Kids don’t have this problem, because the plan is built in: same classroom tomorrow. Adults have to make the plan themselves, and most don’t.
That’s why ‘we should hang out sometime’ almost never leads to anything. A plan with a day and a place does.
Why can’t I make friends? A quick check
If you’ve tried and it still isn’t working, check which of these fits. Each one has a different fix.
How to make friends with social anxiety
- You meet people but never see them twice: you need something that repeats every week, not more one-off events.
- You have good conversations but nobody follows up: you’re waiting. Send the invite yourself, within a few days.
- You avoid situations because you’re afraid of being judged, and it’s lasted months: that may be social anxiety. NIMH describes social anxiety disorder as fear of being judged that lasts at least six months and gets in the way of daily life. Cognitive behavioral therapy is the standard treatment and also builds social skills, so it’s worth talking to a professional.
- You have no time at all: find friends inside time you already spend, like a lunch break, a commute or your kid’s practice.
You’re far from the only one
In 2021, 12% of Americans said they had no close friends, up from 3% in 1990 (the two surveys used different methods). In a 2024 Pew survey, 16% of US adults said they feel lonely or isolated all or most of the time, and adults under 50 were more than twice as likely as older adults to say they often feel lonely (22% vs 9%). But 46% of Americans made a new friend in the past year. It does still happen.
A practical way forward
Each reason above has a matching fix. Make the hours repeat: one weekly activity with the same people. Replace the lost settings on purpose: coworkers, neighbors, one class or club. Assume you were liked more than you think, and follow up. And be the one who asks.
A four-week plan to make friends as an adult
- Follow-up within 48 hours: ‘I really liked talking with you on Saturday. I’m going to the market this Sunday. Want to come?’
- Turn a one-off into a regular thing: ‘That was fun. Same time next week?’
- When you have a free evening: HMU’s Meet Now gives you a five-minute chat with one person and a shared opening prompt, free for adults 18+, three a day. You both privately choose Keep or Pass, so nobody has to guess whether the other wants to keep talking.
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- Is Bumble BFF Worth It? An Honest Review — In the US, BFF costs nothing, so the real cost is your time. What you get, who it suits, and a two-week test to find out if it works for you.
- Apps to Make Girl Friends: 6 Options, Compared — Women-only apps, mom apps, hosted friend groups and free options, compared on price, format and who each one suits. Every detail is from the app’s own page.
- Best Apps to Make Friends in a New City, by Week — Nextdoor, Meetup, BFF, Timeleft and HMU each fit a different stage of a move. Which to install first, what each costs, and who should skip which.