This is common, especially for people with anxiety. Also for people who are consistently on the receiving end of people holding grudges. I'm bad at this too.
What goes up, will inevitably come back down. Whoever you have to step on when you go up, you will be at their mercy when you go down.
The truth is strictly what the ones in power perceives it to be.
Enjoy any good things, even the little and menial ones, as you will never know what impending distresses could descend upon you in a moment.