As part of being human there are a range of emotions that we go through. Some of these emotions like anger, embarrassment, disappointment, jealousy, fear etc., which are considered negative, can even do harm if they go un-managed. The first step to manage any of these is to become aware of these feelings and express them in helpful ways.
For example if you are aware that you are angry you can do something to prevent self damage or harm to others if you express it in a way that’s non-harmful to anyone. Suppressing any emotion is not the healthy way, as it can lead to some unhealthy effects on your personality, for example suppressing anger can lead to depression. But, if you are aware that you are angry then you can express anger in non-harmful ways, like by talking to someone and finding a solution, or using it as an energy to unleash your creativity.
To become aware of your emotions you will have to look for the cues that these emotions give out. These cues can be physical, like when you are angry your stomach gets tight, heart is beating faster, jaws are clenched, etc.. Sometimes cues can also come from kind of thoughts that come in our mind. For example, if you get thoughts like : “You did that on purpose…, You wanted to hurt me…, You think you’re so good…, I’ll show you…, You started it…, There’s no justice…”, probably you are at verge of getting some negative emotion.
Once you are aware either by physical or thought signs, then you can respond / control them, for example, you can then remind yourself of the unhealthy consequences of the particular emotion, and think how you can calm yourself down, give more time to other person whom you think has made you angry before jumping to any conclusions about his/ her intentions.