16 and Balding

I am 16 years old and I think I am starting to show signs of male pattern baldness. I noticed a few weeks ago that the hair on the crown area and top of my head was thinning, but I haven't noticed any major signs of a receding hairline. I started researching and found that hair loss can be genetic. So I asked my grandfather on my mother's side when he began to lose hair and he told me that he started noticing hair loss when he was 18. Another thing I found while researching was that amount of exercise can be linked to hair loss. Which, if true, can be linked to my hair thinning because I was training in MMA fighting for about two months but recently stopped and suddenly didn't do any exercise at all. As soon as I stopped training is when I began to notice that my hair was thinning. Also, I am experiencing slight itching and tingling in the crown area of my head. Another thing is that I do shower and wash my hair, on average, two times a day. I was surprised when I noticed my hair was thinning because I grow hair on almost every other part of my body except for my back. I have already set an appointment with my dermatologist, but it won't be for another few weeks. I was wondering in the meantime if it would be a good decision to start using a thickening shampoo and take vitamins. So if there are any suggestions that you can provide I would greatly appreciate it.