If you don't weigh exactly what you say your goal weight is -- let me offer this point of view.
You are at your goal weight. You currently weigh exactly what you want to. If that is out of alignment with the number you would like to see on the scale, then that means that your goal needs some strengthening. What you weigh now, is exactly what you wanted to weigh.
Every bite of food and every step you took is what led you to where you are now.
This isn't bad news -- it means you can achieve what you want. If you aren't happy with where you are -- then together we can start moving in a new slimmer direction.