I have this to say about trying to sound Female. Do you remember the show 8 is Enough there was an older sister there that had a very deep voice. I used to hear her and think it was a guy trying to sound like a girl. The thing is she was very tall girl as I remember it. Her voice was very deep and I have heard many female voices and I have heard a lot that were very low almost like a male.
So, do not be afraid if you are dressed and someone asks you a question or wants to talk to you, just do your best and enjoy yourself. I believe that is the most important thing, enjoy what you are doing.
Dress like a female, act like a female and do the best you can with your voice and DON'T WORRY what others think. Enjoy yourself and others will sense you are enjoying yourself and you will be accepted easier.
You have to be happy and accept yourself before others will accept you. If you smile the world will smile with you, if not they can, well you know. Just smile and be on your way. Don't ever let on they have hurt you with their words or their actions. Just be the person you are inside.