Alot of the serious things that people here already mentioned, unable to see a bright future for humanity. Cant afford a house of your own, etc.
But another thing that affects me day to day is Seeing stray cats and dogs on the side of the road. They just make me sad and then i have the urge to help them. And then realizing that i cannot help them all.
“A day may come when the courage of men fails when we forsake our friends and break all bonds of fellowship. But it is not this day.” An hour of wolves and shattered shields, when the age of men comes crashing down. But it is not this day. This day we fight”
Martin Luther King Jr.