And not to negate the whole doctor thing, 'cause that muy importante as well, but, Black Castor Oil works wonders for thinning hair.
If you do go see your doctor and it's not something big, ask if you could take that route. Typically, at 15, they really root for more natural things instead of you taking medication, so, I'd ask about that.

(But, like, don't do it instead of going to see your doctor. 'Cause, like she said, there could be something wrong that's bigger than what some oil can fix.)
December 21, 2011 - Last Relaxer
April 1, 2012 - Transitioning Began
March 30, 2013 - Big Chopped

High Density. Medium-Low Porosity. Kinky. Shoulder Length.

*Excuse my Texas.