I was presenting myself in public as a little girl, starting at approximately five years old and continued cross dressing from that age forward. Many people who did not know otherwise believed I was in fact a girl. Puberty changed all that. I had to deal with a beard and and the beginning of a manly voice.
Over the years, I learned to deal with the voice issue by training myself to speak in a feminized version of my normal voice. It is far from perfect, but it is not my normal harsh male voice. I have also learned to couple my feminized voice with female mannerisms.
There are other things I do too, which add to the overall female image. Look people in the eye when speaking to them and smile. In stores and other places, I show my southern lady manners and thank people or tell them to have a great day!