I have tried that being positive but I did not get the results I want, you will win if you are lucky even if you are feeling positive, and even if you are feeling negative you can still win if you are the lucky guy of the day, but it always helps you to become a better person, if you are always positive.
Yes, life is like this. Being positive won't always get you the results you want, but you will have the mindset to persist to get equivalent ones.
With gambling, it comes down to luck at the end. However, some people think that there's no such thing as randomness in the universe and that everything happens for a reason.
I don't believe too much about it while gambling, reason why i tend to avoid randomness as much as possible unless i feel like there's something valuable to learn from it.