Good actors are shy

Funny I always thought actors are mostly extroverts, if not how can they weep or do outrages performances in front of camera/crowd?

Funny I thought wrongly. Clint Eastwood, Gene Hackman, Robert De Niro, Henry Fonda, Russel Crowe, Johnny Depp... are all as shy and as introverted in spite of their commanding presence, both cinematically and physically.