How to forget the real world while on stage?

I'm currently in this 1940s play. I'm in a 'child' dance (although im not a child but rather the oldest one in it) and one girl keeps pushing me around. not backstage but literally on stage. i get easily angered so this has been a problem for me. If i go on stage mad i dont feel like smiling or twirling around like im supposed to . i can't stay in character like this. Advice!?