i know how your feeling i have had this for 20years most will say your crazy or its not possible. leave me your email and you can share your findings i can share mine.
sometimes you might even give off smells like skunk etc depends on what you eat, sudden exposure to cold weather makes it happen for me sometime(open car window after bieng in heated car). the weird thing like you said i often cant smell it and they ask did you fart, very depressing...