I obsess over how things smell?

I have some hereditary OCD, mainly having to do with fear of things being dirty or unsanitary. Lately I've worried about how I/my surroundings smell. If I don't like the smell, I feel gross and need to shower right away. I ask my friends if I smell bad, they say no, but I have a very strong sense of smell (I detected mold in the washing machine after smelling it for weeks!) how can I stop worrying about the fear of smelling bad?