If you want hormones and you're underage, you need parental consent so you'll have to tell them.
If you are stuck living where you are and can't stand being called by female pronouns and a female name, you'll need to notify people so they will not (you can try, at least.)
If you're not in that kind of situation, no reason you can't just pick up, leave and start over. I wasn't comfortable talking about it either, but I had to if I wanted to get anything done since I'm underage and it turned out well. If you do come out, I wish you luck.