You can do it. Last year my wife and I would do long rides (65- 85) miles to get ready for a century. Now that we've done several we don't train as much. This week we rode 55 on Sunday and won't get to ride all week. We are riding in the Tour de Corn century this Saturday too. Don't psyche yourself out. You are ready. Take a couple of days off before the century and hydrate well. Drink before you get thirsty and take some snacks. If you can stop at a restaurant or convenience store and grab a sandwich halfway through. Report back with your results. You got this.