Some people seem to think that happiness is the result of all the right things that happen at the right time, it's easy to be happy when everything seems to go your way, but I think that defining happiness in that way reduces it to just luck, or an accident, which is not, in fact, could even argue that luck is a product of happiness.
Some days are good, but there are probably more bad days, and it is in those days that true happiness is revealed, you have ever met someone who has remained positive, even when you are having a bad day, if you are having a bad day, Being close to someone like that can be encouraging although for others it is annoying, but that is only due to jealousy.
People who are able to smile even in the worst moments have learned a very important lesson, happiness does not happen alone, it is a choice, it is not an accident, it is not a gift from the universe, of course, it is nice to receive those gifts, happiness consists in choosing to see the adventure in each moment, choosing to understand that there will always be a light after darkness, that there will always be something good in every situation and every person, no matter how dark things may seem.
That's the key to happiness: choosing it, it's not an easy choice all the time, and it may very well be the last thing you want to do sometimes, when it seems you can not take a break, sometimes all you want is to get bad mood and stay annoyed, is a natural response, choosing to be happy will make you a better person, stronger, wiser, more patient.