This word, Raah, can, by extension, be translated as friend. "The Lord is my friend" presents a beautiful picture of the intimacy that we can have with our Lord. He is our faithful, never failing, Friend, the friend that sticks closer than a brother.
Shepherds must have sheep, and for the Shepherd to adequately care for His sheep, those sheep must follow Him, obey Him, allow Him to care for them as He sees fit. There can be no wandering. The sheep must trust the Shepherd and accept the care He provides. Sometimes the best pasture is on the highest mountain, and the way can be difficult, but the pasture at the end of the climb will be worth the difficulty required to access it.
If I want Jehovah to be my Raah, my Shepherd, then I must be the kind of lamb that follows, no matter the path. Our Shepherd is always faithful, but are we?
The Lord is my Shepherd, I shall not want.
He makes my lie down in green pastures;
He leads me beside quiet waters.
He restores my soul;
He guides me in the paths of righteousness for His name's sake.
Even though I walk through the valley of the shadow of death,
I fear no evil, for You are with me;
Your rod and Your staff, they comfort me.
You prepare a table before me in the presence of my enemies;
You have anointed my head with oil; My cup overflows.
Surely goodness and lovingkindness will follow me all the days of my life,
And I will dwell in the house of the Lord forever.
Psalm 23:1-6 NASB