Christ using the image of a shepherd for himself was, in his cultural context, a profound act of humility. Shepherds were among the lowest ranking workers in the social hierarchy of the time. God humbled himself by becoming one of us through the incarnation. He further humbled himself by calling himself the shepherd of his flock.
But Jesus makes clear that he is not the usual type of shepherd, who is hired to watch over the sheep. The hired shepherds will flee when lethal danger appears, because they don't have a connection with their flock beyond their wages. But Christ, who is God, has an existential connection with us. God is our creator, our redeemer, our sanctifier.
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