I asked that question of my husband after I was dx GAD. He told me that no, not everyone worries all the time or is paranoid or comes out with a whole scenario that ends with a death in the family if I don't triple check that the car door isn't locked at night before I go to bed (I live in an area where you don't really have to lock your car). Odd how I thought that it was normal even though I knew in the back of my mind it wasn't. So the answer is only people with GAD or other types of anxiety disorder worry like you or I do, but yes worrying in general is human nature. It is the excessiveness of the anxiety that makes it a disorder.