Happiness is just a neurochemical spurt. Four different brain chemicals create happy feelings, and you need all of them to feel good. You miss out when you rely on one or two old familiar ways of triggering your happy chemicals. You can enjoy a balanced happy chemical diet if you know the distinct kind of happiness each brain chemical evolved for.
This type of happiness is triggered by physical pain. The body’s natural morphine masks pain, which allowed our ancestors to run from predators when injured. Humans experience endorphins as euphoria, but it obviously did not evolve to trigger a constant feeling of joy. You would touch hot stoves and run on a broken leg if your brain were always releasing endorphins. Nature saves them for moments when they help you do what’s necessary to survive.