Power word - everything

When you speak, reality itself listens. You have been given the ability/curse/power to shape reality around you. The catch? Whatever you say becomes true or manifests itself, no matter how small. When you were young, you thought it was amazing, but one day you had an argument, you said something you shouldn't have. Will you be overwhelmed by the power? Will you take control of it and use it for your own pleasure? Or will you use it for others?