Dear evolving beauty,
I understand what you are saying and think that you have been given a bit of bad advice. MOST feminine characteristics of walking, speaking, etc are learned socializations, not something "natural." I grew up in a wealthy, old money area (though my family wasn't) and girls I knew went to finishing schools, cotillion classes, and joined high end sororities. They do so to fit in properly, please mom and dad, and develope confidence. Now, I am not advocating this, merely reporting. I do, however, think that some instructions and a lot of practice can help you with the confidence and presentation thing.
Look for anything by Danae Doyle. She has a web site, has been around for a long time, and specializes in the type of TG instructions you are after. No, I do not get paid. But I do have DVD's from an earlier attempt at transition. She was a coach for Cisgirls going into pageants like Miss Amereica. She covers walking, sitting down, arm gestures, speaking, etc. How to be a bit elegant. I'm not saying you have to be going for that high end look, but sometimes you have to overshoot the mark in order to fall back to where you actually want to be. It doesn't come natural, but you can find your comfort zone. She doesn't cover the actual voice qualities as well as some I've seen. You might try looking here at Susans for "voice" threads.
Many girls spend lots of money on various surgeries only to have the passing veil shattered as soon as they speak or move. Perhaps that doesn't bother some. It seems to bother you and can be overcome relatively inexpensively but with a good deal of effort.