Buddha said that suffering is an inevitable part of life.
Suffering means anything from death and dying, to great physical or emotional pain .. down to that constant hum of dissatisfaction that tells us that things could be better. And even if we do manage to get what we want, nothing is permanent .. we will lose what we have at some point.
Buddha also taught that WE cause our suffering, and he went on to recommend actions and practices that change that.
Most of us try to "stuff" our dissatisfaction where we can't see it, and we try to stay busy: career, shopping, music, pleasure, adventure, love, sex .. etc. Pleasure. Enjoyment.
But underneath there is this rumble of dissatisfaction .. just as, even in the middle of the night in the city, you can hear that faint hum of tires on pavement.
Paradoxically, once we stop trying to be happy, we become happier. We become lighter and more joyful.
You don't do that by pursuing pleasure, because you will be hooked and controlled by your need to to try to drown out your dissatisfaction.
As Henry David Thoreau wrote, "Most men lead lives of quiet desperation and go to the grave with their song unsung."