Decades worth of research concludes that happiness is the good mood you get from social interaction

How Nearly a Century of Happiness Research Led to One Big Finding: Decades of wellness studies have identified a formula for happiness, but you won’t figure it out alone

Which is fine if you're an extrovert.

But in former times happiness at its root was simply thought of as good fortune, or as escaping misfortune and accidents, which seems to me a more inclusive definition.

25% of a given population, after all, is composed of introverts, who feel drained by social interaction, not enriched. But they are just as happy to have escaped being hit by a car as any one else.

The field of psychology still seems biased toward the extroverts.