Great and just beautiful comments from everyone. I would add this...
Being an atheist is about the disbelief to one claim only - i.e. the proposition that God(s) exists. It says nothing about what one should believe, or fight for, or what may be a useful and positive world-view. It is only the beginning of the adventure and A LOT of work. Once one leaves Gods/faith behind, there is much work to be done and the need to create a world-view based on reason and evidence. For me, what helped was learning more about secular humanism, science and nature, social dynamics, politics, etc.
What I found was that there is a lot of bad in the world AND a lot of good in the world. And, I found that I could look at the bad things and, instead of running for a "security blanket" like a child, act like an adult and engage to help others and affect change. Regardless, I will take reality over fantasy any day of the week and twice on Sunday. As far as I know, this is the one life I do have and, even at its worst, it is pretty damned good.