Be flexible and spontaneous with your plans, and be okay with that.
It is ideal to at least plan ahead. Only a few handful brave travelers set off to nowhere without a single plan in mind, and really do get away with it. But we are not molded in that same manner. So if you do not braved up for that kind of adventure --- it is okay. Be confident on how you want things to push, or move along through. You need not be the perfect cookie cut-out of someone else's travel style.
Here's to remind you that no matter how foolproof your structured plans, and itineraries may be -- there's a general room for error that is a requirement needed to be applied. Be open to changes in itineraries, failed travel plans, or mishaps along the way -- some of the best travels are the spontaneous ones.