What is the chance that you help contribute to the depression of those around you? That you set up goals and a level of inspiration that they can never reach?
That your greatest kindness only hurts them more? That stepping into happiness, for you, draws a bigger contrast between your lives, AND that you failing and being miserable isn't any good either.
Depression is simply a normal and natural response to when we are in a situation that we can not stop playing and are not finding anyway to FEEL success.
A SEVERE depression is when the person stops, on a biological basis, seeing pleasures and success. It's when those things just don't find "resonance" in the system of the person.