I am worried about my hairfall. please tell me how to reduce it and make my hairs more healthy?

At your age: I always worry about iron deficiency/anemia causing hairloss and of course stress. So I recommend you see dermatologist for evaluation and treatment based on your diagnosis

Avoid chemicals : Avoid dying your hair if possible , excessive cosmetic procedures such some hair extensions or using strong cosmetic products . Talk to a dermatologist . He/she can recommend the best products for your hair and scalp with the same or better cosmetic outcome as mainstream products. Good luck