How would you even make it ‘blank’? The character has got to start out with a physical avatar, which is either a girl or a boy. You literally said yourself,
So you would obviously star out as a girl. A lot of RPGs have you start out as a boy since they’re more likely to play video games, and nobody cares about that.
Since you have the option to change into a guy avatar, I have no idea why you’re offended.