Its my strong OPINION
(but not proven, or substantiated, or probably not even agreed upon by others)
That taking finasteride, or dutasteride, when u have none or very little hairloss, will only accelerate it. beyond the intial shedding period i mean.
this is based on mine and others experiences.
I'd wait and see whether its male pattern baldness.
lots of people recede around 18-21, then stop and stay that way. Its scary, and forces ppl to take drugs which may be unneccessary.