‘Life is what happens to us while we are making other plans’! Cannot remember who said that, but I believe its true! I think focus requires a great deal of discipline, but aside from discipline, you need to be interested in that on which you are focussed!
I was enjoying a conversation with some participants on one of my courses. We were discussing how NOT being able to stand up and speak in front of a group of people can HOLD you BACK from whatever you want to achieve. Rather than have speaking as an asset that can benefit you, from increasing your confidence levels to being sure that should the opportunity arise(and it WILL) you would be able to step up to the plate, take the bull by the horns, and offer to speak or give a presentation.