Are you saying what you mean? Are you meaning what you say? Do you find it impossible to engage in social conversation? Are your attempts at written communication lackluster, to say the least? Unless you are one of the gifted few who are blessed with charismatic communication skills, you probably fall within the "normal" category.
We begin to develop our ability to communicate as soon as we leave the womb! In the beginning those cries and non-verbal communication let people know what you do and don't like about a given situation. That approach works for awhile.
As you age and your communication skills develop, the chances are that you will fall into the largest group of humans on this planet - "nice people with less than perfect communication skills.