yes, essential oil molecules are inhaled through the nose and go to the brain and into the bloodstream whether your sense of smell is intact or not I should think. I second what Saturnine says and think there is the possibility of your sense of smell being restored at some point, but that is good you are content without it too.
There is some interesting science about essential oils, I happen to have one article up in another tab that talks a little about it, with the sesquiterpenes and stuff. they can penetrate the blood brain barrier, which is pretty awesome. so you see it doesn't require you being able to literally smell them for them to work their magic hehe
https://livelovefruit.com/10-essenti...rain-injuries/
Of course using the oils topically, especially on the soles of your feet, is a great approach too. You get the benefit of the skin absorption, and you're still smelling them on you so it's going into your brain and bloodstream that way additionally. It's said that when you put oils on the bottom of your feet, which actually have the biggest pores of the body, in a matter of twenty minutes I believe it is, pretty much every cell is exposed to the oil!
That is really interesting you were born without a sense of smell. and yeah you are right to react negatively to bathroom sprays and perfumes, most are so full of toxic compounds it is devastating.. though wearing essential oils can even help us ward off some of the exposure of those negative compounds I'd think in multiple ways.