If you listen to a lot of music of have loud surrounding, the little hairs/nerves in your eardrum can die. The high pitch noise can mean one of those nerves is dying. i listen to a lot of music n my...
Generally, most humans are incapable of hearing sounds above 22 kHz. This varies with age, and most people 19 and older can not hear 20 kHz or above. More information (and audio clips) are available...
It is the sounds of silence....nahhhhh but seriously you don't have any problems. It is normal to hear a high pitched sound. If it bothers you then you can consult with an ear-nose-throat doctor but...