I never outlined; I just had story ideas and started writing, most of the time having no idea where it would go. but once I started taking a writing class with my siblings back in September, I realize how helpful an outline really is. You know what's going on and the outline is subject to change at your whim (or at the story's whim, whichever happens).
Now, if I could actually complete the outline I'm starting for a story idea I've got, that'll be great!