Having no close friends does not point to one personality or childhood history. Survey data can describe how common the experience is; attachment research can describe one possible route to self-reliance. Combining the two does not prove why any individual lacks close friends.
What the friendship survey found
A 2021 report from the Survey Center on American Life found that 12% of Americans said they had no close friends, while 13% reported ten or more. The survey also documented broad changes in friendship over time.
It did not ask whether people without close friends had learned in childhood to hide their needs. Work schedules, moves, health, caregiving, bereavement, discrimination, social opportunity, temperament, and personal preference are among many possible influences.
What attachment theory describes
In reviews of attachment theory, Phillip Shaver and Mario Mikulincer describe how repeated rejection of bids for comfort can encourage “compulsive self-reliance,” in which signs of need and vulnerability are suppressed. That framework offers one plausible pathway by which asking for help can feel unsafe.
It is not an explanation for all social isolation. A person can be self-reliant and still have close friends, or have no close friends for reasons unrelated to early caregiving.
Questions are more useful than assumptions
When someone wants deeper friendship, small acts of reciprocity can help: sharing a manageable concern, accepting an offer, following up, or asking for something specific. Those actions create opportunities to learn whether a relationship can hold mutual need.
They are options, not a test. Some people prefer a small social world and do not experience it as a problem. Persistent loneliness or fear of relying on others may be worth discussing with a qualified mental-health professional, who can consider the person’s actual history rather than inferring it from a statistic.