Hi please help I am 19 and my hair is falling out in clumps I don't no y

Do you have a bald spot or bald spots or is it coming out evenly throughout your head?
Do you dye and/or bleach your hair regularly?

If you have (a) circular bald spot(s) it could possibly be alopecia
And one of the causes of that could be vitamin & mineral deficiencies.

Try some aurvedic medicins ,gulf gate hair fixing after total lossing hair