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.
Exactly.
Because the house doesn't give a care about how you feel, all they care about is to maintain their bankroll every single day to make profits out of noob players and greedy players. Emotions, luck, or anything doesn't guarantee your wins in gambling, if you're gonna lose then you're gonna lose and if you're gonna win then you're gonna win, simple as that.
We just have to accept the fact that gambling is not for everyone. You don't have to do trial and error in gambling just because you thought that you're a lucky person and you might win big in gambling.