Lifelong BO problem

I have had a life long BO problem from lets say from age 7/8 to the present. I am almost 30 years old now. My odor used to be a fecal scent no matter how hard/much I washed the smell was always present. I pretty much have my breath problems under control now and have had this managed for years. However, my Body Odor remains but it has changed. It used to be fecal in nature and now it is fishy/musky. I wash thoroughly but even right after a shower the smell lingers. I can somewhat mask it with medicated powders but I want to smell like a normal person. I know most people don't have to go through what I go through and I still smell. All help is really appreciated.