I’m always prepared to loss my bet yet I'm always feel upset whenever I loss all my bankroll. I think we can’t remove the fact that feeling bad and upset every loss is a part of gambling since we are always saying to prepared losses.
Using spare money that you consider to grow by gambling will always give a pain when take away from you. As gambler, I don’t really believe that there’s a way to accept to loss without feeling bad about it.
Loosing money always hurts, but that is why you only need to gamble with money that you are prepared to loose. If you go to Vegas, your mindset just needs to be on having fun and having a budget that you want to spend on gambling; but you always you need to be prepared to loose it all as that is what most likely will happen.