Don't have grudge in your mind when gambling because your thinking and ability to process well will be definitely affected and you may not be able to make proper gambling decisions and that may also affect your chances of winning too because you aren't gambling with the right mindset enough to create that edge you will need to be able to win the game but then if you are gambling with the right mind you may be able to put all this in place for yourself.
Keeping your anger in? That is a waste of energy. Your mind should be very sharp because it is your most valuable tool. Pay attention to your plan, the big picture, and why you're playing. It's not about luck, it's about timing. It's about how you handle the cards you're given, even if the tech slides one in your direction