That doesnt mean you smell bad I always keep my window down even if im driving by myself. I sometimes drive with friends that smoke and they even forget to roll down their window and Ive had b.o. for a while. I usually make sure the windows are down when i drive with someone so I dont embarrass myself but theres been many occasions where ive been in the car with windows all the way up and people act fine. You might be thinking its because of you but chances are it is not. It is paranoia. Stressing out about it makes matters worse as you start to sweat from your apocrine glands which smells much worse. Being constantly stressed also puts us in a constant fight or flight reaction in which the body pumps blood to the most vital organs like the heart&brain which for example impairs the digestive system making us prone to leaky gut syndrome and again Body Odor . Reducing stress levels helps big time in fighting Body Odor .