We humans find it hard to celebrate the success of another without becoming envious. We always feel a touch of envy when others around us succeed, this happens even when we try to hide that feelings.
Envy is in every human, no matter how we try we can't overcome it entirely because the success of another is like a threat and question to our own success and development.
We can reduce the impact of enviness by being happy with ourselves, be contented with what you have now and also work on yourself so you can share your happiness with others when both are successful.
Be happy with yourself.