What Causes Buzzing Noise In Ears?

Hello Doctor My name is Grace. I would like to enquire about a buzzing noise in my ears. ~It is not a major problem as I can turn it on a off at will. ~I do not take medication apart from immunisation shots and the occasional Panadol for a cold ~I do not have any allergies ~It sounds like the sort of rumbling a steamroller makes as its paving a new road ~In a normal class room when I turn it on the noise of people talking gets duller in a similar way to when music is turned on (or up) ~At my local youth group I turned it on to find that it was the buzzing that got dulled down rather than the music ~In the past I thought this meant I had superpowers, however they are still yet to be unlocked Thank you for your consideration Grace