Emotion is just a normal part but doesnt mean that it would affect luck chance for you to win the game. There's no factor that could affect your winning probabilities.
You could be happy and think you will have a great day and later you will find out that it's not your lucky day at all, if you are happy and having a great day don't think it will contribute to your success in winning in the gambling, you don't have control and sometimes we tend to be careless when we are full of emotion, it's better to bet when you are more relaxed.