Before you start gambling, the first thing you should do is ask yourself whether your intention for gambling is simply to seek entertainment or to seek profit, hoping to get rich quickly?
This is important, so try as much as possible to lower your expectations before entering gambling. Have a basic understanding of the impact of profits and losses in gambling. Once you have that, then when you experience a loss, it won't be a significant problem, and when you get a win, consider it a bonus.