Emotion is a state of mind.You can choose to be happy or you can choose to be sad.
It is true that your environment has a big influence on which and how much of a emotion is triggered within you.But you have the choice to feel or not to feel those emotions.
It is like a two-way switch.The outside world will flick on-off your switch as many times as they want because it is just a plaything for them.They are not going to experience any effect after all.
But you are in control of the master switch inside of you which turns on and off on your volition.If your volition is dominated by that minuscule switch that the world is playing with,then you are at their mercy.You have no control over yourself.You don’t get to choose for you.You have lost your freedom.
Control your switch.Take control it because it is yours.Your emotions are yours to experience when you want them to experience.World is a stimulus not a source of your emotion.