I've become so sad that I'm jealous of happiness.
What to you mean by being jealous of happiness?
I'm jealous of people who are happy.
You do not have to be jealous of other's happiness. Try to look at it and use it as motivation to be happy yourself.
That's the point. I can't find happiness and I feel jealous of it.
Well everyone is happy for different reasons. Maybe setting some goals and working towards them would be something that helps you feel accomplished.