I've had greasy hair from being a teenager. I went from washing my hair once a week as a 10 year old to washing it every day as a 14 year old. I only started washing it more frequently because it became so unbelievably greasy I couldn't have gone out/gone to school like that.
I have tried to wash it less often several times over the years, the longest time I could manage was in COVID but I still didn't get it looking any better really. I'd even be happy if I could just wash it every other day but by about hour 30 it looks like I've just got a handful of oil and smeared it all over my head.
I've seen/heard lots of people say that if you just train it for a few months it'll sort itself out but aibu to think this just isn't true for some people?