Mastery of the emotions is a lofty goal. To hold a steady state of peace is nigh unto impossible for the average human. Strive for perfection, if you please, but be quite pleased to merely be aware of your emotions from moment to moment. Pay attention to your body. This is your barometer. Is the pressure high or low? Are you comfortable or not? You adjust the settings. Those around you and events around you can set off alarms. It is up to you to sense the alarms and adjust your reactions.
Do you enjoy drama? Then, by all means, keep your settings on high. But beware of the effect of high emotions on the physical body. Do you wish instead for more peace? Pay attention to your human weather station.