The world is too painful, suffering from diseases and many troubles and worries.

This is the process of life. You can be depressed when you are frustrated, but in the end you should dry your tears, forget your troubles and live a strong life. To live is to suffer. Since you are alive, you should face it calmly, don't think too much, don't entangle too much, and let yourself live better. Instead of complaining about life, it is better to put these energies into study and work.