So weak

Recently I read a great quote - "Depression is living in the past, anxiety is living in the future, serenity is living in the present".  I feel the negative effects of not living in the present almost every moment of every day.  My unhappiness is further exacerbated knowing that I will make poor decisions in the future that will result in a past that I am less than proud of.  I feel weak, undisciplined and apathetic, unable to put in the effort that will result in a past that I can feel good about.  I recently described my decision-making as analogous to getting on a train destined for a wreck.  Unable to stop myself, I purchase the ticket, step aboard and foolishly believe that somehow I will avoid the wreck.  I need to avoid the train station...