How Important is training?

So, I am 2 months away from the chicago marathon. My longest run has been about 12 miles. So yeah, I am about half way there.

The closer I get to the day of the race, the more nervous I am getting about actually finishing it. This is one of those times I wish I had a super human power of being able to tell the future. Will I actually make it across the finish line? Will something crazy happen, like for instance, I fall down halfway through and tear something? Will I not be able to finish in the maximum time of 6:30:00 and have to hail a cab to the finish line?  There are so many outcomes that could manifest.

As far as my training goes at this point- i'll be honest. Its not the greatest. I am not as disciplined as I would like to be. For instance, last week I did my long run on Sunday, which was fine, and of course I was supposed to run Tues, Wed, and Thurs. Well, I only ran on Tuesday. I ran again on Saturday but ran alot less than I was supposed to because my ankle was giving out. As a matter of fact, I don't think I have gone 3 weeks in a row where I have really stuck to the training.  I totally underestimated how much time this was going to take out of my life.

That said, I am totally pessimistic about this. Of course I am going to show up on race day, but like I said, I have no clue how this is going to turn out.

It's pretty hard for me to admit the following, because it genuinely makes me feel like a failure. I started to Google research about people who did zero or minimal training before running a marathon. And actually, for those who are interested to know this, most of the stuff i read was fairly positive. There were ALOT of people who said they signed up the day before and did no training, and it was fine. Now, despite what I said earlier in this entry, i actually HAVE done some training and will continue to do so, despite the fact that I am not doing as much as I should be doing. If a good amount of people say they ran it with no training, I am fairly certain I can get through it with the amount of training, as little as it may be, that I am doing. I'm not justifying the shitty training I have done, only trying to assure myself that everything is going to be okay.