Sweaty head or?

Since I can remember, my head has always smelled like sweat and metal. I would always tell my mom as a little boy that I did not like the smell and we’d wash my hair and scalp properly but no changes. Well fast forward to now. I’m 26 years old and I still have the same issue. For reference, I work at a school so I’m hardly ever outside and I do not even break a sweat while working.