The answer is very simple. You gotta see people who are even lesser than you and feel happy and fortunate for yourself. Just imagine, the 2nd richest guy in the world who has shit loads of money that he can buy anything and everything on this planet is still poorer when compared to the 1st on the spot. But that doesn't make him poor.
Similarly, you will always have million above you but ten hundred millions below you as well. Rather than comparing yourself with the higher ones and thinking of what you don't have, compare yourself to the ones beneath you and feel happy about what all you have.
mate you have contributed well truly instead of comparing yourself with people that as gone higher than you why don't you thank God for the people you are gone beyond..
the truth is that we can never be satisfied with what we have on even if we are rich have what we want we will still not be satisfy that is the way human being are
Infact when we celebrate with other that is when we received more blessings I never see the reason why we should because of someone success and become weak