Can God use me?

Can God use me despite my sinful past? For a long time now after coming back to Christ around the time I was diagnosed with Multiple Sclerosis, I have been thinking that God can’t use me because of my sinful past. Some say I was probably never saved. Others say, I rebelled and back-sliding to my old nature like a prodigal son. Reading many materials, I have found that God uses unqualified people to accomplish God’s spiritual purposes. Here are the following God’s CHOSEN/CALLED unqualified people to serve Him. 1. Lot got drunk and committed incest. 2. Abraham doubted God and committed adultery. 3. Jacob deceived his father. 4. Moses murdered. 5. David murdered and committed adultery. 6. Jonah got angry with God (in a sinful way) 7. Paul (Saul) murdered Christians 8. All 12 of Jesus disciples were not qualified to be the Apostles however Jesus called them. and much more. God will use ordinary good people as well as ordinary very sinful people to accomplish great things. Through out the history (in the past 2,000 years), God uses people of limitless backgrounds who can minister “together” (unity) for Christ. God works all things together for His purposes. With my life... past sinful life as well as being diagnosed with Multiple Sclerosis and hearing-impaired, I have learned that even though God does not always permit such serious life-changing situations in my life, but He did lead me into life-changing experiences that heighten my effectiveness in the ministry (or ministries) whenever and wherever He put me. God knows how to get results using people like me. I read somewhere that “There’s no higher calling in the world than to be an instrument of God’s grace.” (John MacArthur). God uses people with the right life experiences by putting them through the right spiritual directions and teaching them the right spiritual lessons. God knows my heart and He will honor my search for truth. God will use me as long as my heart is pure with proper motives. My goal is to concentrate on my present purity before God and allow Him to bless my future ministries whenever I may be involved as He sees fit. In God’s hands, I can be a wonderful and effective instrument in whatever I do for Him.