Hey Luca,
Congrats on getting the letter that's a big step! and an important one to take.
No one here is going to tell you that your fears are unjustified, you are right to be scared!
There is a very real chance that you will lose at least some friends and members of your family, and it is true that Trans* people have a shockingly high unemployment rate
But with all that considered wouldn't it be wonderful to finally stop the poison running through your veins?
To embrace the REAL you with no question for the consequences?
And, if your family can't accept you for you, than they don't deserve to be in your life!
This is a very important step to take, and once you've made it you can't take it back, That being said, go for it, you never know things might just turn out better than expected

P.S. I handled the situation by writing a letter to my parents, I couldn't bear telling people in person :/
I don't know why but I just hate explaining it to people, so when I tell people I really avoid going into specifics, about what I have to do