Am I crazy or what?

I must be crazy or having a mid-life crisis. I just registered for the Disneyland Half Marathon in August. I have always aspired to run a marathon, which is kind of crazy when you consider my exercise track record and the fact that i hate to run!! But hey, it is at Disneyland and it is only half a marathon (okay which is still like 14 miles, am i stupid and crazy?). I noticed it last year and checked it out this year. There is a 5k family fun run and I should of signed up for that. But nooooo, I said to myself, hey if you can run 5k, you can do the half marathon. I am having registration regret. I don't think I can do it. But I have many months to prepare. You have 3 1/2 hours to complete it so I figure I can walk a good bit of it and still finish. I can not decide if I am impressed with myself for confronting fears and limitations and doing things anyway, or just shocked at my stupidity!!