For me, I'm not even sure if I want to start T. I know I don't need it, I pass fine without it. Not real interested in getting hairy, am quite happy with teh hair I already have, and am definitely not interested in having downstairs grow.
But I'd like to keep it an option in case I change my mind. However I am pretty sure that I'd either have to hide it, or move out if I want to start T, as my parents would probably never tolerate it.
I suppose I'd be riding on the fact that my parents will always see me as a girl no matter how my physical changes, and I already present fully in front of them. Not sure how much would change anyways, voice is already male, face is naturally passable, muscles only need some more work in a gym. The only thing that could give it away is the facial hair, since I assume even shaving daily won't hide it.
So yeah. Is it possible to hide the fact that you've started T?