Loosing Focus

Things seem to fall apart at times. I realised that I have began to loose focus. It is constantly happening to me and at times I do not perform to my utmost best. Many times, I have ideas and things I want to do. Most of the times I managed to get it started yet fail to finish it. Is it because of my uncapability? Is it because I am not serious enough? I hope to see myself refocusing this week particularly in my studies, my future and my walk with God.