Hi Marta
To tell you the truth, I was in my twenties but an adult allready.
For what I know, it's different by anyone.
It's just how the body will react on the hormone medicine, it's a matter of fact, that's with all medicine.
There is no golden rule for it, some people react very strong on it and others slowly, you can't say it before.
It will take a lot of time to have fully response on hrt, but, remember your childhood, you were also busy for a few years
from girl to woman, isn't it?
The voice need a lot of practice, it's not only the pitch but also the intonance, the words who are using, the body language.
Even if you have allready the right pitch, women will use other words and phrases as a man, women talk more with hands and arms, so you're lucky if you're a Italian, they do it by nature, otherwise it's practice, practice and practice.
The good news is with hrt you're feeling more feminine and the behavore will automaticly more feminine.
And I wanted to say that I'm admireing you by being so supportly to your aunt.
You're a sweet, kind girl
Hugs
Annette