I admit that it is indeed not easy to train patience, especially with gambling, emotions can usually increase, but it also depends on us who have goals. When I first got to know gambling and gambled, I was most likely to always experience uncontrolled emotions, but with an incident that made me aware that until now I gamble properly. And setting limits on all corners is also good, emotions can be maintained very well. This is a very good improvement. 
You must be able to control everything very well, for better goals in the future. With what you have experienced, you often lose money and maybe in large amounts, you must be able to learn from it, and think about how to minimize it, you must know how yourself because all decisions are up to ourselves.
Yes, it is not easy but if we can practice that over and over, we will have a good chance to have patience. That will help us to control ourselves and will not pass the limit that we set it up. With patience, good control, and discipline, we will not lose too much money more than our bankroll because we will always aware if we almost reach that amount.You must be able to control everything very well, for better goals in the future. With what you have experienced, you often lose money and maybe in large amounts, you must be able to learn from it, and think about how to minimize it, you must know how yourself because all decisions are up to ourselves.
Our goals in gambling is just to enjoy our time by playing gambling and not because of win the money. So we can stop gambling when we almost reach our limits. We will think that we can continue playing gambling in the other days and not have to use all of the money we have in that day.
We remember that playing gambling needs to be moderately to prevent the big lose.
And actually I think gambling also has a positive side, but with so many people doing it wrong, this is what makes gambling bad in the eyes of many people, even though gambling is not that bad. I agree with what you said, we must be able to try to gamble sufficiently to avoid greater losses not only in terms of money but also in other things, because when gambling is done excessively losses can occur not only in terms of finances, but also mental, health or even relationships.