We're  all humans and it's normal for we as humans to react when things are not going the right way or when we make terrible mistakes, even thought we react differently to things, remorse would always come at a point in every gamblers life, whether you're gambling for fun or for any other idea, let's say for instance you're a sports bettor and maybe your teams performance was poor and you decided to bet against them, then they win, definitely you'll feel very bad because you'll feel guilt of not trusting your team and also sad that you lost your bet which you placed against them.
 Asides that gambling is a game of luck so you shouldn't be in a rush to place a bet, take your time and be sure there's of winning with the option you picked, also when you fail to carryout the risk management in gambling you'll always be likely to feel remorse, also spending recklessly as well can cause people to feel sad when they fail in gambling, avoid being greedy because it would always come with guilt and make you feel remorse when your bet turns bad.