I am a 19 year old female. I have a receding hairline. It's an issue. Is there any way to keep it from worsening?

The best way to keep your hair
loss from worsening is to identify the true underlying cause and determine any
and all conditions and allergies. General illness and poor nutrition caused by sudden
changes in diet, crash dieting, bulimia, protein/calorie deficiency, essential
fatty acid or zinc deficiency, malabsorption, hypervitaminosis A, all can cause
thinning. Your hairline is likely to recede further if not addressed, once the
cause is treated you may be able to regrow the miniaturized (thinning) hair
using oral and topical therapies obtained through complimentary virtual or in-office consultation with a Ziering specialist. These therapies can slow down or
stop the progression of loss and in some instances reverse the thinning hair.

it is necessary to visit a hair restoration physician to find out the cause for you hair loss. Once the cause is diagnosed then the proper treatment options can be recommended.