Jealousy is a natural emotion based on fear and anger, when others have something we want, or are doing something we want to be doing, or wish we did. It is useful to acknowledge this emotion so that we can better understand our desires. By understanding our desires we can better regulate our happiness / sorrow.
When we feel jealous (or start to feel envious) we should analyze why we feel jealous. State for ourselves what it is we are jealous about (honestly). Then explore options for what to do about it. List what we have already in our life, to compare experiences and possessions with desires.
Beliefs we have can cause jealousy. For example “Everyone is out to take advantage or me.” “They are trying to control me.” “I need them to not feel alone.” Some our assumptions may be very false, but can be changed. Pick beliefs that are nurturing and supportive, but have boundaries. Don’t listen to beliefs whose only purpose is to make you feel jealous.
Improve your self-esteem, will-power, and goals in life by working on them regularly with lists, charts, brain-storming, meditation, games, and practices. Acknowledge your accomplishments. Make lists, keep a journal, and maintain a calendar. Some people recommend “faking it until you make it”, but i say just be honest about your feelings… at least with yourself… and with others if you can. Honesty will help deal with the issues behind jealousy, and a rational mind can resolve many issues.