Have I gone mad?

I don't know what it is, but emotional stress causes you to do some crazy things. Right now I'm in conflict with myself, however amid the conflict, there seems to be emerging a random thought or rather goal I would like to achieve. I've decided after a short jog to run a half marathon. It's kind of crazy and I don't know what prompted that thought or desire but it's something that will give me more focus and more purpose you can say. I've got about a year to train... I should be okay by then. At the same time maybe, a year from now I might be in shape enough to run the full marathon. So it's something that I know will be really hard, but I think if I stay focused and work hard it shouldn't too bad. I hope... I don't know, I guess you can say I've gone mad. Like all the craziness going on in my life prompting me to run 13 miles? Or 26 miles? That's like super far! I don't know... is it a good idea or have I lost my mind? I just need to get my running times up to about 10 minute miles. Right now I'm running about 8-9 minutes a mile but I'm running at a pace where I know I wouldn't be able to make 13 miles. And running at this pace I can only get about 2-3 miles of running in. So every week I'll update my fitness and training status and how I feel about my running that week. I guess every Friday seems to be a good day to do it. So if anyone's following, Friday will be my weekly running update. Have I gone mad? I'm not sure but I do know I won't give up on this one.