Extroverts and introverts are two types of people who generally prefer different activities, environments, and work styles. Extroverts tend to be more social and enjoy being around other people, and they seek stimulation from their environment and thrive on new experiences.

The Social Care Institute for Excellence (SCIE) says "social isolation and loneliness have a detrimental effect on health and well-being". 

Some consider loneliness a primary emotion, on a par with fear and anger. For millions of years, survival relied on being part of a gathering; being isolated from your community was dangerous. 

But now, a fear of loneliness can keep us in a toxic relationships, unfulfilling jobs, or destructive marriages.