I might had good moments in my life, but I never really felt happy or satisfied with it. But on the other hand I know that people had a lot worse life, so I always tried to not be obsessively negative about it and I always try to go forward, and make at least some sense out of it.
People tend to overrate happiness. It's a good goal to strive for, but you cannot be happy all of the time. It's physically impossible, if you experience a happy sensation for too long your mind resets the baseline.
There's pretty good evidence to suggest that billionaires for example are not demonstrably happier than someone who is simply well off. If you have enough money that you can live comfortably and you're sick, that's basically your lot. It doesn't get better than that from a happiness point of view, can have nicer stuff but it won't make you happier.
We as a society have been failing our billionaire class by not taking all of their money and assets away, so that they can once again have something to aspire to, and experience the moments of happiness that come from climbing the wealth ladder. Their mental health is suffering, as a result. Just look at how they behave in public, and their covert cries for help. It's a damn shame.