Drama can feel like therapy whereas comedy feels like there's been a pressure and a weight lifted off of you. You come to work and you laugh all day you go home and you feel light and there's a certain feeling when you're sitting with the audience and they leave after 90 minutes and it's just pure escapism and they're happy.
You need to develop somehow a huge amount of faith and confidence in yourself because there's a lot of rejection throughout an actor's life and you have to believe in yourself more than anyone else.