I have blonde hair,  or fair hair, is a hair color characterized by low levels of dark pigment
 WHY IS THAT .. IS IT NATURAL OR DID YOU COLOURED IT
it is natural,  The resultant visible hue depends on various factors
OH.. I WOULD LOVE TO HEAR THE REASONS IF YOU ARE COMFORTABLE TO SAY
Well I have heard The color can be from the very pale blond (caused by a patchy, scarce distribution of pigment) to reddish "strawberry" blond.