Referring to Myself

Yesterday I was chatting with a coworker on messenger (she is also one of my best friends).  As we were chatting, I was updating a marketing flyer.  One of the updates was adding a bullet point of 5 Docks.  I ended up typing 5 Dicks.  Thank goodness I noticed what I typed.  Otherwise that would have been bad.  So I told her what I typed, her response was "freud what?".  I joked saying I guess I know what I have on the brain.  She laughed.  Then I made the comment of I'm sure you don't hear that often coming from a guy.  That got me thinking.  Do I still refer to myself as a guy?  I mean I still look like a guy, but I think and feel like a girl.  For people that know me being a transgender woman, do I start referring to myself as a girl or should I remain referring to myself as a guy until I start looking more like a girl and dressing more as a girl?  My head hurt just thinking about it.  I'm not sure how to approach that.  When people on Tumblr, blogger, and Genderfest respond to me they all refer to me as a girl.  At what point do I start referring to myself as a girl with my friends?  Guess I have some thinking to do.