Hi Valentina
Unfortunately believe you are correct. But there are different methods one can use to change their voice so that it is more feminine sounding. One is to train your voice by changing the pitch to be more feminine by exercising it to come from the throat and mouth and not from the chest. Or the only other option that I am aware of is to get the voice box operated.
I didn't have to much difficulties with this, I already had a voice the was higher up on the scale towards feminine pitch to start with. I guess it's an asset that came along with my being small to start with.
Cindy