Green with envy, how scary ....

I always consider that one should avoid being jealous to other people's luck . I'm not that jealousy type but I must admit it .. I'm jealous, I'm envious .. , you name it. I absolutely know, envy is one of deadly sins and good people doesn't feel envy but this time I couldn't help my self that I thought my jealousy drove me crazy. I couldn't resist it though I can't say I like the condition.
Why do sometimes world seems so unfair to us ? In my believe, always think positively and do only good things then all good and positive things will come back to you. But I started to doubt it ...
Well ... just give me some times to pull my self back, it's just part of my human nature, isn't it ? Time would heal and help to forget .. but where does the "raindrops keep falling on my head" go ? I need it so badly ... cause green with envy .. it's so scary ..