Common Men, Uncommon Calling

I've been reading the book "Twelve Ordinary Men" by John MacArthur. In the book, MacArthur devotes an entire chapter to each one of Jesus' twelve. So far, these are the things that have stood out in my mind. As the title of this blog suggests, Jesus didn't call the religious leaders and priests to be the men that would spend 3 years of their life with the Christ, but common men that MacArthur describes as,
"perfectly ordinary men in every way. Not one of them was renowned for scholarship or great erudition (knowledge acquired through study. Don't worry, I had to look it up too). . .on the contrary, they were all too prone to mistakes, misstatements, wrong attitudes, lapses of faith, and bitter failure. Even Jesus remarked that they were slow learners and somewhat spiritually dense (Luke 24:25)."
As I've been reading I've been able to draw so many parallels between the lives' of the disciples and my own. I am guilty of so much sin and wickedness, so many things I never thought I was capable of and still Jesus loves me and has called me to follow Him. I know that I have received His grace and mercy and I am one of his chosen people (1 Peter 2:9) but this is STILL such a difficult concept for me to grasp. Why would He call someone like me? Why does He call any of us? I think I still struggle with the truth that I am worthy to be called His son. The only thing I can do is rest in the knowledge of His wonderful love and mercy and live each day of my life to honor and glorify Him. Thank you Lord for your grace!