Do you think there is a difference between hearing and listening? You are right, there is! Hearing is simply the act of perceiving sound by the ear. If you are not hearing-impaired, hearing simply happens. Listening, however, is something you consciously choose to do. Listening requires concentration so that your brain processes meaning from words and sentences. Listening leads to learning.
Most people tend to be "hard of listening" rather than "hard of hearing."