One of the most effective tools I've found for dealing with negative emotions is something called tapping (also known as Emotional Freedom Technique, or EFT.) This video walks you through the basics so you can find out for yourself if this tool works for you. Tap away!
Emotions are so important in our lives, that studies are showing that emotional intelligence, and how you respond in situations, is more important to employers than how smart you are. If someone interviewing for a job shows that they are proud, bossy, a know-it-all, or negative, why would an employer want to hire that person?