you can start a very light medication like nizoral maybe, and go to a Doctor to see if you have a real Androgenetic Alopecia, i still would wait at least another year and half before commit a treatment, your are still a little too young so IF you have Androgenetic Alopecia it's not the ultra aggressive one who force you to take pills and lotion for the rest of your life so early, you can wait a little if you want