You are perfectly normal! And yeah that is an expert opinion. However, the behavior you are describing is not normal. Indulging in a behavior other than normal does not automatically make you abnormal. In order to be really abnormal, this behavior must be accompanied by a near total lack of insight (which is not so in your case).

Since you already know that the neighbors might be hearing, that it is NOT ok, you already have an insight to your behavior. You need to be further talked to ascertain the nature of your problem, but at best it is just an eccentrism. At worst, it is a compulsive behavior which may or may not be associated with a certain psychopathology.