There is a bit of a myth that happy people are naturally lucky and stuff magically goes their way. That they have an easier or shinier path than most. Though sometimes there is a grain of truth in this I have to say I generally observe the opposite.
Happier people, or the deliberately happy, tend to be those who have been through some tremendous suffering or trauma of some sort. The sort of circumstances that change life forever.
I have worked with some deliberately happy people who have been through unimaginable horrors. Loss of a child. Father killed in a car accident. Son addicted to P and a course of self-destruction. Bankruptcy. The most vile custody battle imaginable. Falsely imprisoned. Horrendous marital emotional abuse. Loss of a limb. Rape. Victimised at work to the point of a court case. The list goes on. Bad stuff happens to good people. All the time.
Yet, after time and support for deep grief and processing, many of these people go on to be the most deliberately happy people I know. They gain a new perspective on happiness from the depths of their suffering, their happiness becoming the veritable phoenix, rising from the ashes.
When life (or God or fate or the universe or just other people messing with your life) deals you a bad hand, an interesting thing can happen. Either it can be the circumstance that goes on to define your whole life.