Didn't make it to 20. Now what?

Long story short.  I got to 12 miles and had to call it quits.  I'm really dissapointed and I'm not really sure what to do now.  I am pretty sure this means the marathon is going to be horrific.

When my Aunt picked me up on the side of the road she told me I have to listen to my body (she's right of course, but it's so much more fun to write about success and being fast).  My body is exhausted.  I hope I'll have an energetic day in 2.5 weeks!  I think I'll take tomorrow completely off and do 5? Thursday.  

Thanks for reading!