Are you having a hard time? Did you have a bad day or week?
You need to remind yourself that everything comes to end. Every situation began at some point and it will also end anytime.
This also means that happy situations can end anytime. Accept that you can’t always be happy. Every day there is sunshine but also darkness. Daytime, nighttime. There is nothing like a “happy life”. No one can be happy 24/7.
Don’t be disappointed of yourself when you are having a bad time. This too will pass!