is happiness a choice?

I have had major depressions before because of events in my past that have given me much grief. I hear people say something to the effect of, 'you have a choice to be happy or sad, and that you are the only one who has the power to make yourself to make yourself happy or sad'. I was wonder what you think of this. I know some people choose to be sad because of self pity or because they want attention, but I also feel sometime people just can't can't control how they feel. I remember hating when I cried all night, and when I had to wear sunglasses everywhere because I couldn't make myself stop crying. I eventually made it out of my Depression alive, but I didn't want to be sad, yet I couldn't make myself happy. What do you think about this concept? Tweet