It's really not that difficult to be happy. You just have to be grateful and especially appreciate what you do have now. The rest will come, my dear.
To wish bad things for someone else, is like looking for high blood pressure. Because strong people fall, but stand up again.
When you focus on revenge, you're uploading only negativity to your system. You should focus on moving forward and enjoy the little things in life. For we know, that innocent smile of yours is a big obstacle in the eyes of the haters.