Ask "what's great about this?" when something goes wrong.
Whether its an acting audition you failed or you find out traumatic news, you have to ask yourself that question
Once you build up a substantial career, you will be working frequently. Regardless of how much acting work you have, life will happen.
Things can go good, bad, or maybe tragic and it could happen while you are in the middle of filming a project.
Instead of freaking out and compromising your performance, have a one-on-one with yourself and get ahold of the situation. By learning tactics like this now and preparing for them, you are likely to avoid letting your problems effect your career in the long term.
Learn from difficult situations, don't let them sway your emotions.