Most of us went out the first time not looking anything like a perfect woman. Just do the best you can with makeup, wear clothes to blend in with other woman in your age group and learn some basic female mannerisms. Don’t wear high heels, wear comfortable shoes and wear sunglasses to hide your eyes which express nervousness very easily. Most of don’t have feminine voices either, we just try and talk softer and slower.
You will have to accept the fact that you will be read many times. Most people don’t care or are somewhat accepting or at least tolerant.