Happiness is relative, maybe age bias but very individualist. Give an 8-year-old a bicycle and just might find yourself become the favorite uncle or aunt. Give the same to a 35-year-old man and you WILL give a different reaction. The same developmental expectation that makes a 7 years old believe in Santa is on the opposite side of the coin that allows a 25 year analyze just why he doesn't exist. Here is the deduction, there is no such thing as a universal happiness, you have to define, who you want to be and what makes that person truly happy.
Now happiness is no the butterfly feeling you get in your belly when things seem to go as planned. It isn't the smile or the shout of joy that accompanies a group of friends having a good time. It is slightly deeper than that which is why something as superficial as a feeling will never accurately describe it.
Happiness is on terms that you decide will work for you, in spite of what is going on around you. In fact, you may want to dig a little deeper on that- let us abandon the pursuit of happiness and seek the pilgrimage of Joy.
Life on your term, emotion under control, analytical mind that put things in perspective are all an outcome of intentional happiness. No, it is not a 24-hour jolly ride. No, it isn't the cocky attitude, everyone can go blazes either.
Happiness is not a destination, it is not in an event, even though some events create a feeling that expresses it. Happiness is an inward dialogue based on the ground rules you set for yourself. The moment you hinge how you feel on someone else or any external factor; you have yourself enrolled for a jolly ride on a very unpredictable sea.
Yes, you can be happy but you have to be intentional about it. You owe yourself that much.