You know, it’s normal for gamblers to grief on their losses, especially if it’s hard-earned. But based on my personal experience, it’s only in the beginning where you will feel regrets wishing you did not gamble your money. Eventually, you will develop the right attitude towards gambling as you become more exposed to different gambling scenarios and realize that losses do often appear compared to your gains.
I would even to further and state that grieving ones losses is a completely normal part of being a gambler in special when someone is new to this world and one feels like a fool for gambling money against which could have been used in other different ways, though the process you are talking about which is developed through time, I would call it gambling "desensitization", it occurs when the novice gamblers realizes how fast money comes and goes if they take high risks for the sake of high and quick earnings.
Though, I must point out this process of desensitization is slower depending on how much risk one takes during one's gambling sessions, they're will be people who prefer to play dices with low multipliers instead of going for a 2x per roll. To them, desensitization is slower and way more painful, as the gains are small and then bad luck strikes, they end up losing a significant amount of money which is very possible to surpass their gambling budget of the day or even their weekly gambling budget.
Desensitization is an important part of casinos and gambling culture, a casinos (specially brick-and-mortar ones) encourage it by detaching the real value of the money being wagered by gamblers, through the implementation of chips.