You can be happy by creating your own definition of happiness.
Wikipedia.org says..
"Happiness is a state of mind or feeling characterized by contentment, love, satisfaction, pleasure, or joy."
You could also find other definitions from many sources in the internet nowadays.
However, the keys to happiness are not from others.
Happiness is within ourselves. Happiness is our own state of mind.
Then we all have personal power to be happy.
“Most folks are about as happy as they make up their minds to be.” - Abraham Lincoln
Happiness is like the taste of food. For the same food, even the same dish of food, can taste differently in each person's opinion.
So you can be happy by knowing and creating your own definition of happiness.
No need to focus on the beautiful words or sentences. It's the feeling you have that matters.
You may enjoy creating your happiness definition by choosing and defining when you are happy. You feel content and joy when you do what kinds of activities.