Age 19 and I'm going through thinning of hair from the crown and my hairline receding.

If you are losing hair and want treatment options you should schedule a consultation with a doctor.

Just because there is no obvious balding in your parents or grandparents doesn't mean that your thinning isn't genetic.I would suggest a thorough evaluation by a Dermatologist or experienced Hair Restoration surgeon.A complete history and physical exam should be performed and any organic causes of hair loss ruled out(severe anemia,thyroid disorder,autoimmune disease).Barring any of those efforts should be directed at stopping the progression of hair loss and possibly thickening up some of the existing hair.This can be done with one or a combination of the following-Finasteride(Propecia),Minoxidil,Low Level Laser Light therapy,PRP(Platelet Rich Plasma).Limited hair transplantation may also play a role.

Most probably you have a androgenetic type hair loss. I dont advice to use finasteride because of possible side effects and being under the necessity of using that chemical for almost life long to stop hair loss.You may start to use minoxidil %5 to thicken the crown area and stop hair loss.You would better planning to have a hair restoration surgery when you fell uncomfortable about hair styling or total loss of hair..