Body hair all over my body.?

I am just 15 now and am a boy. But my chest has lots of hair. Not long hair, but just a lot. I even have hair surrounding my . I have minute hair which can be felt and seen on my forehead and my cheeks. My legs are full of hair, my back and side torso also has hair. Even my backside has lots of it. Why do I have so much hair. I think that all there hair will grow longer as I age.