How to get out of the sadness and anger?

Yupin(535)

It's depend on a topic or what it's about. If it's about my mistake I always spend much time to get out of it by recall how it occur and what part I miss ,then tell myself it's last time I do it and cheer me up I can do it better and never be like this again.But if it's aout another one I just careless about them because just I who still sad while anoter one never care.