Managing emotions is defined as acknowledging how you feel and choose how you react. Along with physical elements, the training context should include emotional aspects. You may experience an emotional roller coaster before a competition; this is normal. It's important not to deny these feelings when negative emotions come up, such as anxiety and performance-related stress. Just feel and let these emotions be as they are without judgment.
One way to increase awareness of psychological states in sports is to practice mindfulness as a form of psychological skills in sports. This approach is a Zen concept where you allow all incoming thoughts and emotions to come and go. Then, just observe without judgment what enters your mind.