Hair loss on daily basis does occur normally, but when quantitatively very high, one must then question. Its usually uncommon to encounter extreme hair loss at ur age. I hope that you are not experimenting with different shampoos available in the market.  Treatment is always based on detail history and clinical examination. Fungal infection can occur thus please visit a doctor and get yourself examined to add solutions to it. Good luck.

Difficult to diagnose without examination. Fungal infection of scalp is uncommon at this age group. Could be seborrhoic dermatitis.