They are just feeling threatened due to your pheromones LOL (I have still to see conclusive studies on this).
Do you think you smell bad?
Try an "anti-perspirant" instead of "deoderant", Lynx Dry works for me and I used to sweat a lot more in the gym using the standard one. I did't smell (that I know of) but I've known people there to stink without sweating so I thought I'd be better off looking dry.
Do you eat very spicy foods or anything like that?