What was I thinking?!?!

As most of you know, I have been spending the last 16 weeks training for the Bi-Lo Marathon in Myrtle Beach, SC which takes place on February 13, 2010. Yes, that is only a month away! I am FREAKING OUT! Where did I get this crazy idea to run a marathon by the time I turn 30?? I am having serious second thoughts about this but I realize that there is NO turning back now. I ran 16 miles yesterday and it was rough. I kept hitting a wall every mile or 2 once I hit the 8 mile mark. I finally started feeling better at mile 13 and then by mile 14, my feet, legs, lower back started aching.....I stopped quickly to adjust my fuel belt and to start running again KILLED me. I was so stiff and I only stopped for no more than a minute!!! I was in tears when I finished and I seriously don't know how I am going to run 18 or 20 miles for my next 2 long runs. I am going to have a serious talk with myself before and really prepare mentally, otherwise I may never make it. The good news is I only have 2 LONG runs left before the marathon. Everyone keeps telling me the training is harder on you mentally than the actual marathon. I sure hope they are right....One thing is for sure though, this will be my FIRST and LAST marathon ever!! However, I do see many half marathons in my future...:)