Whatever you create is perfect. At a later time you might want to examine the drawing looking for themes in the patterns and colors. Your drawings will often give you great insight into the meaning of your emotions. If you feel comfortable, you might want to show your drawing to a friend. Often someone else can see things that are hidden to you.
Some people use movement or dance as a vehicle for expressing emotions.
Other people use exercise as a way to vent built up feelings. Writing a letter allows you to express your feelings to others. You do not have to send the letter to the person unless you want to do so. Sometimes expressing the feelings is more important then sending the message. You might want to write one letter that you know will not be sent as an exercise in catharsis.