Our brains are destined to restrain those memories which have a significance to us and forget the unimportant things. One of the techniques people use to remember things such as names is to associate the name with an attribute of the person. This attribute needs to be something that will invoke an emotion (it may be funny, vulgar or disgusting,etc.). The same principle can be used to remember other things. However, if this problem is creating a significant impairment in your life, I would suggest that you should first get a thorough psychological evaluation from a trained professional like a psychologist or a psychiatrist.