I too feel a significant degree of embarrassment and reluctance to refer to myself in an overtly masculine manner. But identification as a female does not make one a lesbian. To take on that distinctly descriptive term and throw it around as you are based on some sort of fantasy is simply absurd at best and frankly, it is highly disrespectful.
You are not a real lesbian. Take meaningful steps towards transition and perhaps others will buy into your erroneous self-perception (versus your self-perception being less erroneous).