Well you say you wouldnt use this gesture on a guy, and while presenting as male other woman didnt use these gestures on you?
Not using these gestures on guys seems to be somthing you have in common with atleast some of the other women you work with. (I point this out in hopes to ease some of the tention this is causng you)
I go buy a rule, that just because sombody ells does somthing doesnt mean I have too. And thats because above all ells Im Me an individual, unique and a person. If I adopted every behaviour that presented itself like this, I would be nothing more that a combination of the most common attributes of every other woman I met, and where in this case would my individuality be?
I think it is for situations like this that the saying "Be true to yourself" was inteded. Instead of looking at it like other woman do it, so that means I should, or as though not doing it undermines your womanhood. Look at yourself instead and ask, is this somthing im c omfatabledoing? and dont think as though it is somthing you should be comfatable doing either.
Things like this have a way of causing us to sub-contiously conform over time anyway. basically my advise is, dont worry about it, and in time you might find yourself doing it automatically in similar situations to other women you have witnessed doing it regardless.
I hope this helps.