I see it as a disability because it makes some things difficult for me to do. In some cases, things may be impossible for me to do.
Some narrow-minded people don't accept the term "disability" because they can't distinguish the difference between "disability" and "disabled". These people often claim that being deaf is not a disability. However, there are others who claim that being deaf doesn't stop them from doing anything and because of that, they don't see it as a disability. I do understand the logic here, I just wish I was in that situation myself!
"Normal" is a subjective term. Everyone has a different view as to what constitutes "normal".
If you asked a random person in the street "Is it normal to be born deaf?" I am willing to bet that most people will pause, and then say "No." Therefore, they could draw the conclusion that deaf people are not normal. (In the context of being deaf.) While I don't see it from that perspective, I can understand their reasoning.
When I was a kid, my mum once told me "Being normal is being
different." Ever since, I chose to look at it that way.