Here is how to break free:
Between reality and how we see it are several filters, letting us see only a fraction of it, to prevent information overload. One of them are our expectations. In other words, what you 'look for'/'expect to see in the world'.
Connections between braincells get stronger with use, and the more you use your 'the world is a dark place'-braincell network, the easier it's activated. Bad news for example activate and therefore strengthen this network. There is a story that relates to this.
A painter, an architect and a pick-up artist, old friends, walk through a city, up to a mountain. From there, overlooking the city, the architect says: Boy what a beautiful city this is, the architecture and color-play is simply amazing. The painter smilingly nods, while the pick-up artist looks at them strangely. You talk about architecture after we've came across what felt like 15 of the most beautiful women in the world? he said. There were indeed some beautiful women, the painter said, some of which he'd love to paint someday. Dazzled, the architect said: I saw none of them. Obviously, every one saw exactly that which he had trained his brain to see the most.
Drama queens are drama queens because they focus on drama all day long. Happy people are happy because they focus on what makes them happy.
What you focus on expands, and as Taxi drivers have been found to have bigger, stronger connected inner-map-areas, and pianists bigger, stronger hand-motoric-areas in their brain, that's not just a cute saying.
To break free from your current reality, you must force yourself to focus on what you want to see in the world 2-3 times a day and for 21 days in a row. 21 days is the time it takes the brain to form a new filter or in other words: habit.