You should probably have an
MRI of your
brain performed. This will be more sensitive to evaluate the
brain and its contents. Why did you have a CT performed? Do you have other symptoms such as numbness, tingling, weakness, visual disturbances, sensitivity to hot water, etc?
I suggest that you be evaluated by a neurologist. Being 25 years old is young to have atrophy and more information is needed to determine either why you do or whether or not the CT was overread.