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Seltzer said that many factors make someone an introvert, but the most prominent among them relates to interacting with others, which drains their energy. "It doesn't much matter what their social skills are or whether they actually enjoy the other's company, they still feel depleted after being in another's company for a substantial period of time," the psychologist told Bored Panda.

"Because of this, they require more solitary time to regroup than do extroverts (who are energized, or re-energized, through socializing), which is one reason that, overall, introverts prefer to engage in solitary activities. They also prefer to write rather than speak, listen rather than talk, and small gatherings vs. large, boisterous parties."

Dembling added that introversion is one of what personality psychologists call the Big Five traits (openness to experience, conscientiousness, extroversion—and therefore its opposite, introversion—agreeableness, neuroticism). "Some studies find that the brains of introverts are more active even in resting than those of extroverts, which causes us to be more easily overwhelmed/overstimulated," she explained.

There's also a huge body of research showing that extroverts are happier. But one recent study by the University of California, Riverside, psychologist Sonja Lyubomirsky and U.C. Riverside graduate student Seth Margolis suggests that simply acting like an extrovert might actually boost well-being—even for introverts.

The researchers had 131 undergraduates initially undergo a number of assessments to set a baseline for their health and personality. Next, Lyubomirsky and Margolis asked the students to alter their behaviors in specific ways for one week. Some had to be more "talkative, assertive, and spontaneous"; others were instructed to be "deliberate, quiet, and reserved."

(Although these behaviors were not labeled extroverted or introverted, Margolis and Lyubomirsky essentially pushed the students to act within those categories.) At the week's end, the two groups took the same tests that had established their baseline, and then they reversed roles for the second week. Afterward, they took the assessments one last time.

The researchers analyzed responses to assess whether acting as an introvert or extrovert had any effect on well-being and discovered that leaning into extroverted behaviors resulted in participants reporting higher measures of well-being, including positive emotions, a sense of social connectedness, and flow (full immersion in an enjoyable activity).

The opposite was also true: people who acted more introverted than usual saw declines in well-being. "I kind of wish the research didn't show that, but it does," Lyubomirsky said.

Writer Sophia Dembling believes that Western society favors extroverts. "For example, many teachers grade students on class participation, which can be difficult for introverts, who do better in small groups, in writing, one-on-one," she explained. "Business also tends to favor extroverts. Introverts can find it difficult to shine in interviews, which are a form of performance, although research has found that while extroverts are better at getting the job, introverts are better at getting the job done."

"And introverts can have difficulty getting their voices heard in professional settings. In her excellent book The Genius of Opposites, Jennifer Kahnweiler suggests that introversion and extroversion should be treated as a diversity issue and that businesses do best with a balance of both and people who understand both," she added.

Psychologist Leon Seltzer also supports this notion, but he doesn't think that extroverts have it better everywhere. "My understanding is that in the U.S., extroverts outnumber introverts, but that the opposite is true in other parts of the world, both in Europe and particularly in Asia," he said. "If you look at ads in this country, you'll see that having a good time is illustrated not by someone sitting quietly reading a book but by eating and drinking with friends, playing sports, riding bikes, and so on."

"Moreover, it does seem to be true that in some subtle and not-so-subtle ways, introverts in America are discriminated against, almost as though their preferences are somewhat perverted. Added to this, creative individuals tend more to be introverts than extroverts, and being alone is less associated with loneliness than it is with extroverts."