>>418792975
Well first and foremost, I really have zero desire to change the way that I speak.
I don't think it sounds all that great is another reason. I can only think of one or two people who actually sound female, most people just sound like dudes making a weird voice.
And even if I wanted to, I really just don't have a lot of vocal range and speak the way I speak. 

Voice training is a lot of trouble for something I have very little interest in.