My life is but a weaving
Between the Lord and me,
I cannot choose the colors-
He worketh steadily.
Oftimes He weaveth sorrow,
And I in foolish pride
Forget He sees the upper
And I, the underside.
Not till the loom is silent
And the shuttles cease to fly
Shall God unroll the canvas
And explain the reason why.
The dark threads are as needful
In the Weaver’s skillful hand
As the threads of gold and silver
In the pattern He has planned.
– Grant Colfax Tullar
Don't Worry. 
This poem reminds me of President Bednar’s most recent metaphor: individual strokes of a painting contribute to an overall masterpiece. Both light and dark strokes are needed to provide contrast and dimension. You seem to be experiencing more than your share of dark strokes, but I have no doubt that you are becoming a masterpiece.