It isn’t easy to keep yourself from experiencing and indulging in negative emotions such as anger, annoyance, irritation, sadness, etc. However, these emotions only prolong a negative emotional pattern, and keep you from being happy.
When you begin to accept your life for what it is, you will be able to enjoy every moment, no matter what happens.
Accept what is.
For example, if someone cuts you off while you’re driving, accept that it has happened, and move on. Do not personalize the situation; realize that it is simply what is.