I would recommend reading Seven Habits of Highly Effective People who which I derive the statements below.
If try to think about the world as a growing pie versus a fixed pie. In a fixed pie world, everything is limited so there's only so much success, money, jobs and accalades to go around. So when someone else does well, it's natural to be jealous because they are taking part of the pie that could have been yours and now there is less out there to fight over. It's scarcity mentality and most people thing this way.
If one thinks about the world as a a growing pie, it means that there is plenty to go around and it's possible to work closely with those who are successful to create a bigger pie i.e. there is no longer need to compete but to collaborate. This builds better relationships and generally a more positive, healthy attitude internally as well as lower stress levels. This is what is known as abundance mentality.
I do not know whether this stuff is scientifically proven but from what I understand, this trait is far more prevelant in self-made millionaires. Having made a move in a similar direction, I can report feeling better about myself and having a better attitude.
Further to this, the book also suggests focusing on what you can control and what you can do. So in this case, worrying about others success is a waste of resources.
I found it helpful to spend less time on social media and Linkedin. This helped me to reduce my jealously.