The open door is never behind you; the open door is always before you. Quit looking at your past life and mistakes. Look unto Jesus who is the Author and Perfector of our faith. Your open door is not in the opportunity you missed ten years ago, it is not in some stuffs behind you that you can't get back. You can't gain your access by giving attention to your past life. Your past days are behind you and what God has for you is in front of you. Just pay attention.