These are the words of someone who tried and lost... Can we learn any lesson? Everyone has a chance to try something, and some succeed and some don't... but no matter what happens, there's no crying.
To avoid that regret & crying simply don't gamble with money you can't afford to lose... and if you have already decided to do it and risk everything you have, don't complain afterward. It's in vain...
It's easier said than done, a lot of gamblers talk about giving staying away from gambling after having terrible experiences and losing a lot of money, after few days of staying away they still find themselves back to it again. But everything should be a means to learn from, everyone cannot be lucky in gambling, so if you end up losing its your choice to move on or continue. The last point you made is very important, in order to avoid unnecessary regretts that won't solve anything just gamble with what you can afford to lose so it doesn't affect you too much.
