I can't watch most of my work. Once I come on screen, all I can think of is 'What am I doing with my hands?' or 'Why did I lean that way?' or 'What's that look on my face?' It's too difficult to not focus on evaluating my acting.
Working crew made me realise that the actors are a very small part of a very big machine, with each part being vital to make the show work. It so important to remember that it's not about you, it's about the show, and working crew hammered that point home to me.