Just a quick note: I only recently realized that the world (media) is actively set up to make everyone grumpy all the time. And it isn't just the news and social media - many comedians are just bitching about every little thing. And most "serious" movies and TV and books are very dark and unhappy.
Mindfulness has helped me realize this. I don't have to be angry at everything. Unless the anger is actually going to change something, being angry just makes the world a worse place.