Is the world in black, white or gray? We're used to hearing that it's neither black nor white, but filled with the grey that is inbetween, as if it's something set in stone. It's not.
Things change according to how you view it - it can be black, it can be white, it can be grey... Or it can be a rainbow.
It's easy to say "It's up to you to change how things look to you", and in one way everyone is responsible for their own situation and state of mind... but not always.
Sometimes we can't help how we feel - we are complicated beings and I don't think any science or study will ever be able to understand 100% how we work, or why we work the way we do. We affects ourselves, we are affected by others, we are affected by the environment... and perhaps by something else inside us that we don't even know of. There are just too many variables and individual differences to generalize.
I hope though that the variables will make things more on the bright side for you, soon.
LOL! Well, I wasn't really referring to me, personally, but the world as a whole. I think things are pretty gray, but some of the elements of things are pushing it to the black side. Though, I am not generally a black-or-white type personal. I feel that the nuances are too vast to color anything absolute (there are a few exceptions though, but in general).