Sorry to hear training hasn't been the easiest this year. I'd say that running your first marathon (assuming since HM first was Jan 2016) in Goofy is definitely an accomplishment no matter how you cross the line. Whether it be first or last. (But the feeling of accomplishment is individual so by no means do I want to tell you how to feel about it.) But I guess I see it that way regardless of the distance. If this were your first 5k, I'd say congrats on the accomplishment. I can understand being frustrated with a training cycle that didn't go your way, but chin up. Try to remain positive and find some reason or goal as to why this will be the best Goofy run ever!!!
Motivation is truly a personal thing. For me, I know that I won't reach the lofty goals I set for myself some years ago unless I get out there and do it. That's why my running motto is "If you want it, PROVE IT, by doing what is necessary to get it." I'm motivated by goals. Others are by food, or alcohol, or weight loss, or competitive siblings, or because a friend/parent told them they couldn't do it. Ask yourself, "Why did I sign up for Goofy?" That's the reason I would use to getting out there and crushing it. I hope you can reinvigorate those fires that got you going the first time around. There isn't much time left until race day so don't treat these last few days as a cramming session. Just do the best you can on race day and be happy and proud about it. And if I see you cross the finish line, I'll make sure to call you a "Goof"!
! I may peer from a distance for a few seconds at any particularly romantic looking couples 
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