As someone else has mentioned in the thread, the book Learned Optimism is all about this. I have also found learning meditation from the book The Mind Illuminated to be helpful. You could also check out CBT, and/or the writings of Albert Ellis.
Fundamentally, you will need to learn to let go of your negative perspective. One thing that helped me with this is realizing that the facts of reality are one thing, and how I feel about them are another. These are entirely orthogonal, and rewiring yourself to react differently to things is very doable, especially if you realize that your negative reactions are not helpful.
Fundamentally, you will need to learn to let go of your negative perspective. One thing that helped me with this is realizing that the facts of reality are one thing, and how I feel about them are another. These are entirely orthogonal, and rewiring yourself to react differently to things is very doable, especially if you realize that your negative reactions are not helpful.