Important to define what is happy and what were problems to begin with. I'm 39, no kids, and my parents weren't happy with me, but were happy otherwise. How does this factor how I'm unhappy?

Happiness should be the end goal. Contentment is part of it. Compromise. Quality over quantity and the quality doesn't have to always be great, just no regrets according to modern death bed speeches. Being happy can mean chasing one thing and not the other, which would lead to some unspoken regret, loud enough in our head.