I’m 5’11” and was “shedding” at 15 and finally started shaving my head at 38 because it was too thin to comb from about the age of 28 or so. Dad was 6’1” and had “the fringe” but nothing on top.
That’s because everybody comes up and pats him on the top of the head.
My son is about 5’4 and started losing his hair about the same time as you. There would be shedding all over. In the shower, his bed. He shaves his head too. My maternal grandfather and uncles We’re all balding. Husband has all of his hair. Crazy.