I guess the major question, Mira, is are you really a Transvestite, or are you a Crossdresser? A MTF Transvestite dresses enfemme in order to have sex like a female. A Crossdresser, of either sex, dresses because they like to, and just maybe for other reasons. For example, I am a MTF Crossdresser. I dress enfemme simply because I like the fit, feel, and look of feminine clothing. I have no desire to be a woman, just to dress like one. And I was married for almost 50 years to a lady who totally supported my CD activites. Although Transvestites and Crossdressers both wear the clothes of the opposite sex, they are 2 different types of people. So please decide which you are, since you are the only one who really knows!!
Having said all that, I am glad that you came out to your sister. Being in the closet is no fun!! And apparently she still loves you, as it should be!! Best of Luck to you!
