There's much to be said for feeling numb. Time passes more quickly. You eat less, and because numbness encourages laziness, you do fewer things, good or bad, and the world's probably a better place for it.
Unhappiness is something we are never taught about; we are taught to expect happiness, but never a Plan B to use to use when the happiness doesn't arrive.
When future archaeologists dig up the remains of California, they're going to find all of those gyms; their scary-looking gym equipment, and they're going to assume that we were a culture obsessed with torture.