help me

I heard that a guys sexual prime is from age 15 to about 30 and a woman is 30 plus. Why then am i always horny and want sex. Am I normal or different. I just cant seem to shake the urge or get enough. I find myself masterbating 4 to 5 times a day. i try to suppress the fealing by occupying myself with other interests but it doesnt seem to work for long as i always fiind myself wanting sex. Can anyone suggest any help to get me over this and get rid of my high sex drive. I'm thinking of professional help but thought i would ask here first.