Hi, my son who is 21 now had same problem when he was 17. His father and grandfather are bald. I took him to dermetologist, he priscribed Propecia for him. He said it has sexual side effect and goes away when yo sop taking the drug. He has lots of hair now and he does not lose any more hair. However, news is floting around saying that the sexual side effect comes from propecia is sometime not reversible. Asyesterday,he stopped his medicine. I am really worried if it has done any damage to him or not. He has never been in any relationship, so he really can not tell if it has done anything to him. please read more on any medicine you take.
I would recommend seeing your Dr and having tests ran. It could be that your testosterone is low, your thyroid is low, or you may just be getting male pattern baldness. Even though it does'nt happen in your family does'nt mean it can't. Yes, there are treatments available, but you need to discuss these with your Dr.