If you have a dream in which you are disoriented then this dream has a similar meaning to a dream in which you see something distorted. Disorientation is usually used in one of two main ways. You could be disoriented in that you are dizzy and you literally are out of your orientation. Perhaps you have been spinning around a lot. As far as what this definition means to your life, it means that things are happening around you so quickly that you find it hard to keep track of all of them and it makes your life a whole lot more complex than you really want it to be. It can be hard to keep track of these changes especially as you age and as you get accustomed to a certain way of living life.
Another meaning of disorientation is that you feel like you have no idea where you are because you are not where you normally are or you have been taken out of the place where you usually spend most of your time. You are now in new surroundings and trying to find your bearings somewhere new can be really hard. If you have a dream where you are disoriented in this sense it means that you have been trying new things lately. This is a fantastic way to open up and see the world around you, but if the ultimate effect is a disorienting one rather than one of a great experience then this means you might want to reconsider your goals.