I got you ...i had this feeling also....first off I found out the cause of this feeling. so ask your self ? what i got as a cause which makes me depressed ,envy,loss of concentration ,motivation ,inspiration and intersest for any aspect of life was that (guss what?)....comparing myself with others in any path of life from the smallest up to the biggest part of life.... And it was a damn shit which holds me back from achieving what i want If it is similar causes .. Stop comparing and start praying with full of heart,strength