I think that the reason that you cannot smell yourself is because the receptors in your brain got "used" to it, it like when you spray perfume or cologne on yourself in the morning and go to work/school in about 30 minutes you cannot smell it anymore, but people around can comment on it even 6 hours later… You just got used to it. Only in this case its not perfume or cologne. I have the sam problem, if only I could smell myself would be able to control it but since i cannot smell anything it sucks trying to figure out what really works.