There was an interesting study[0] done on Facebook users in University that had the following conclusion. A quote from it:
The multivariate analysis indicated that those who have used Facebook longer agreed more that others were happier, and agreed less that life is fair, and those spending more time on Facebook each week agreed more that others were happier and had better lives.
We tend to get blasted with other peoples' expectations and visions of success. Without establishing our _own_ definition, we'll never find that illusory success that we've projected upon other people and other circumstances.
What's _your_ definition of success? Everyone's will be different. It might be helpful to shorten your question: How to stop feeling depressed? The bleak patterns of depression are masterful at creating a monster to slay, in this case, for you: "being successful". If that dark knot was gone, would it matter?