After you force yourself to bet, get ready to be losing too because they both work together. If you notice that you are forcing yourself to gamble then just know that you are gambling because you think it is the best way to make money and you are either addicted already to gambling or getting to that stage. Forcing yourself to gamble puts you in a situation that you have to make profits to keep yourself happy but since you can not be making profit always, you will find yourself most time sad. If you are not feeling relaxed gambling then you are doing it wrong and you need to stop immediately or change the way that you are gambling. It could also involve changing the games that you play and the type of gambling that you do.
And I liked your explanation of the situation. It couldn't have been better. It always seemed to me that I was forcing myself to play in order to win money, and this happened quite rarely. That's why I was not in a good mood and walked around sad and upset most of the time. That's why, indeed, you should approach gambling only when you have a positive attitude and a good mood. You should always be prepared for the fact that money will be lost. You should not count on winning all the time.