Why does my pubic hair grow so fast ?

Wax, tweeze, use an epilator, or debitate. The good thing about not shaving is the new hairs will not be prickly and much finer starting out. If you are really sensitive try a sunburn reliever that has lidocaine, put it on thick(leave on for at least 15 minutes), wash it off quickly and choose wax or epilate. The more you pull them out the less they will bother you being pulled out.