David Bowie needed this persona to perform, he was otherwise an introvert and shy.

“As an adolescent, I was painfully shy, withdrawn. I didn’t really have the nerve to sing my songs onstage and nobody else was doing them. I decided to do them in disguise so that I didn’t have to actually go through the humiliation of going onstage and being myself. I continued designing characters with their own complete personalities and environments. I put them into interviews with me! Rather than be me — which must be incredibly boring to anyone — I’d take Ziggy in, or Aladdin Sane or The Thin White Duke. It was a very strange thing to do.”