Do you have a lot of anxiety associated with repeating yourself? Meaning, do you feel like if you don't repeat yourself you'll go crazy or feel a lot of mental anguish? Typically, that is associated with having OCD. Major anxiety! If this isn't a big deal for you and doesn't really cause you any discomfort or stress, then it's more likely just a quirk of yours or some other issue. But you would need to see a professional to make that diagnosis.
It may be OCD. If it is making living your life difficult, you could perhaps talk to a therapist. If you see no reason to seek treatment, then that is fine as it is your choice.