Sure, sometimes I'm jealous of certain friends, and sometimes some friends are jealous of me, but those feelings have nothing to do with anyone's successes - they're merely an indication to us that we're resisting our callings, or wasting our talents.
Everyone is pathetic and insecure now and then. The happier among us know that such feelings usually indicate that it's time for a change.
What could you do that would feel like a worthwhile accomplishment, if only to you, and why aren't you doing it?