Boy howdy, they can be a piece of work. I have friends who where abused by their parents. I tell them and smile, you get to pick their nursing home. I have been in rehab and it's its own kind of hell.
One of my friends has done very well to over come it, but you know, I can see it in his eyes and he is 45. I'll tell you it breaks my heart, same look as people who went through a bad war.
Not everybody in the world can be happy, stuff happens and sometimes nothing can be done. Happiness doesn't march in on silver platter. You have to make best of your situation. You have to, in the end, create your own happiness.