I think it more a human trait than anything. Many are plagued by not finishing things. I think one way to keep on track is to divide any project or task into a series of sequential mini-tasks or goals. Work on these one at a time and check them off as completed. Try and not get bogged down in the larger task which may seem overwhelming. Instead concentrate on the smaller tasks leading up to it. One thing we have to do is force ourselves to walk through any fear or discomfort and face these tasks. Making them smaller makes it a bit easier as opposed to looking at the "BIG" picture. After we have done these individual tasked and finished the project, we will find that it just wasn't that big a deal.