Maestro Chris,
My heart goes out to you, not in pity, but in recognition as I have held similar feelings looping through my conscious mind as well for a long time.
Is there a one-size-fits-all, golden advice to give here... I think not as this is a personal issue we all have to find a personal solution to. For me it came in the lived experience of my children; when I felt extremely down one time I was playing with my young son in the yard and I saw my neighbor doing the same with his son and having a much more explosive physical way of doing so. I felt extremely down... and made the error of stating to my 6yo old son: "I'm sorry I'm not more like our neighbor." And to this day I Vividly remember my son's befuddled, confused face looking at me when I finally dared to lift my head and look at him; "I hate that man, daddy, why would you want to be like him ?!?!..." he said to me and I physically felt my world brightening...
We all need our personal moment of insight, to understand that: the only one you should be comparing yourself to, maestro Chris, is yourself of yesterday.
No one else has walked in your shoes, has had your obstacles caried what you do everyday. So try not to get seduced to compare apples to oranges 
best of luck,
Kada