I do the same thing, but i feel like my voice shatters my image... I dont want people to pretend like I'm a girl, i want people to treat me like a girl because they see me as one. Its because of this desire to be treated as female regardless of my voice or how I look, that i tend to be a bit anti-social.
Also, being hispanic, we greet and say goodbye to eachother in a special way. Men and women kiss on the cheek, women and women kiss on the cheek, men and men shake hands. Being "what I am", this is cause for a lot of awkward greetings or farewells... which really kinda hurts me. So i just avoid it altogether and do a shy little wave from afar. I don't want to be the only girl who gets a handshake, so i just avoid it altogether. I also sometimes get the feeling that my friends don't like me or don't like my whole transitioning situation... can't say I'm 100% certain if its all in my head or not.