“Anxiety is largely responsible for the survival of the species.”
Introversion and extroversion classifications are outdated. Evolutionary Psychologists identify two biological systems that shape our emotionality:
Extroversion which is the biological system for sensitivity to rewards.
Neuroticism which is the biological system for sensitivity to threats.
We can go far if we control these two systems, and we can.
Sources:
Wissam Charafeddine 