Itchy Dandruff, and Hair Loss

by Steve
(Canada)

I am a male, 23, and very healthy. I'm fit, workout and follow a good diet with solid amounts of protein, while drinking 4-6 litres of water a day. However the last year I noticed my hair is thinning, and my head is itchy a lot. I scratch or rub it and tons of flakes cascade down like snow and my hair doesn't seem to fall but jump.
I used to shampoo everyday, unknowing of the harms involved, and as I grew my hair out a few years ago, my hair was never voluminous- but still a full head, I did notice I seemed to shed a lot but never took note really. I had had curly shoulder length hair, which I just recently shaved down as I noticed it really looking haggard, and a bald spot coming in the back, also to avoid me pulling anymore out when scratching.
On my dad's side the males all have full hair still into old age. On my mom's side the men lose their hair in their early-mid 30s. I take more after my moms side for sure but I would still like my hair for another ten years before saying goodbye, as well as to appease my itchy scalp. I switched about 6 weeks ago to a completely all natural shampoo, and only use it 3x every two weeks or so. Is there any way, or treatment I can use to revitalize my scalp to help allow healthy hair growth?

Hoping,
Steve