Hairfall at your age is unusual
just to check upon a few things.
1. Do you or anyone in your family have any thyroid disorder.
2. Did you suffer from any disease like malaria, typhoid or dengue in the last 6 months.
3. Did you do dieting in the last 6 months.
4. Is anyone else in your family having hairfall.
If answer to any of these basic question is yes, then its better to consult a dermatologist for further evaluation. Sometimes anemia is a common cause for hairfall in your age.
So get yourself investigated and get treated by a good dermatologist.