Every Shampoo / Conditioner I try fries my hair and I've never dyed or bleached?

I’m a 24 year old male and have had long hair since I was around 15. I’ve had thick hair most of my life, and over the past few years I’ve noticed increasingly that after I shampoo/condition my hair it tends to get incredibly dry and frazzled. It’s not crazy bad, but I’ve noticed a definite change. I’ve slowly adapted by not using Shampoo’s and Conditioner’s, at the moment I wash my hair every day and only use shampoo/conditioner once a week maybe. I used to use Shampoo/Conditioner almost daily years back, then started doing it every couple days, then every few days ect ect. I generally brush my hair straight back and use a hair tie to bun the leftover hair behind my neck, nothing special. I’ve tried many different brands, including organic shampoo’s, and they all react the same with my hair. It ends up that I’ll shampoo/condition my hair, and it will take two days to go back to normal… Then I’ll have decent hair for four or five days, but then it just plain and simple needs a good cleanse, not because it’s greasy or anything, mostly because i get a very very slight musty smell ( Not nearly as gross as it sounds lol… ) So I end up shampooing and conditioning again which sets me back at square one… I want to try and find a way to take care of my hair so that I always have decent, thick, non greasy, non frizzy.. But I can’t seem to pull this off with Shampoo. I’ve always kinda taken pride in my hair. A lot of guys can’t pull off long hair, they let it get super greasy, tons of split ends, or they let it self dreadlock unintentionally lol… So I don’t understand why my hair is acting this way. Is it just because I’m getting older..? Is this a sign that I’m beginning to lose my hair..? I don’t have any bald spots but it doesn’t seem to be as thick as it used to either…

Ok so I guess my main question is; wtf did human kind do for thousands of years before they introduced our chemically stocked shampoos and conditioners? There are clearly alternatives out there, I’m just not familiar with any of them…

Any input would be very much appreciated. This is driving me nuts. If I want to go out to the bars, or a show, I feel like I have to align my shampooing/conditioning around it haha… Jesus I sound like such a woman right now.