Nineteen does mean you're in your teenage years..
And I think you should stop using the minoxidil too.. Anything that is unnatural, is pretty bad for you. Especially something that screws with your hormones. Take it from me, I've actually gone through all of this because of vitiligo.

And do you really want this?
"Paradoxically, hair loss is a common side effect of minoxidil treatment.[7] Manufacturers note that minoxidil-induced hair loss is a common side effect and describe the process as "shedding". Although this phenomenon demonstrates that minoxidil is indeed affecting hair follicles, manufacturers offer no guarantee that the new hair loss will be replaced with hair growth. The speculated reason for this shedding is the encouragement of hairs already in the telogen phase to shed early."