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"Fear not, O worm Jacob, O maggot Israel."
Yikes!
That really sounds like the words of a kind and loving Father, huh? But, once again, we must remember who God is to understand what God means.
Truly, God is an all loving and caring Father, always close to us and desiring the good. However, in a divine paradox, God is also farther above and beyond us than we could ever imagine. In the same stroke, God is immanent and transcendent.
Today's reading from Isaiah is meant to stress God's transcendence. God may love us infinitely, enough even to become a human Himself, but we are still to Him as worms are to us. This isn't a bad thing by any means! In fact, in our case it is very, very good. God is so far above us that He is in perfect control. In His love for us, He relinquishes some of that control that we might participate in His plan by use of our free will.
Even so, we find ourselves "afflicted and needy." But God desires us to know that He sees us and He will satisfy our needs because He is as greater than us as we are than worms.
So no, God is not calling you a worm. He's using this imagery to speak more about Himself than about us. He could have equally said, "Fear not, you poor, weak, and needy thing for I am rich, strong, and generous."