It’s impossible to be in control of our emotions all the time. After all, we’re only human, and we react to things in different ways as they happen, whether we want to or not. We may get overly excited about something we’re passionate about during a time when it’s probably not the most appropriate, or we might find ourselves getting a little too heated when someone insults someone close to us.
Almost anything can affect us negatively. Pretty much anything can affect us to an extreme degree, even if we don’t expect it to. It can be the major, like aspects of a relationship (friend, family, romantic, or others) that hurt you, to what feels like the minor, like unpredictable changes in routine.