This male co worker does a real labor intensive job and wears work boots, jeans, work clothes. Very masculine clothes in a very masculine job.
He just turned into a woman. He has natural breasts and female identity now.
I am not used to this situation and find it shocking.
Jessica
Please be respectful and use proper pronouns for her. She's a woman and has been one her entire life, even when you didn't know it.
Trans women often try hiding their true identity by taking very masculine jobs, but as you've seen, it never works. Eventually they have to transition.
You can cure your discomfort by learning about her situation. Here's a good starting point for you:
http://t-vox.org/information/transgender-transsexual/trans-101
http://ai.eecs.umich.edu/people/conway/TS/TS.html
Cogito
Why is it shocking?
This person is now happy in the body he was always meant to have, but nature messed up and he was born with the wrong one.
It doesn't affect you at all, so why are you so concerned? Just treat him the same as always, but bear in mind that he now looks the way he has always felt.
Bobbin
You'll get sed to it. Humans are very adaptable.
Anonymous
You'll get used to it.