This follows on from another thread, but I will put in my 2 cents worth.
Yesterday I saw my Gender therapist, and we were discussing where I was in transition, doubts, dissatisfactions etc.
I mentioned that as I am 6'3" and broad shouldered I still had concerns about passing on rare occaissions. He said that as my face now definitely fell on the female side of the line, people would react to that as the main gender marker. He pointed out that that there are a lot of tall women, and women with broad shoulders, such as swimmers, netballers, and other athletes, and that these things were secondary to facial cues.
As I pointed out in the other thread you already have a good start on the facial appearance, so the rest will follow. Laser hair removal and basic makeup will do the rest. As you are young Male Pattern Baldness won't be a worry for you, so you are ahead of a lot of us.
Relax and let Mummy Nature look after you. For exercise it's hard to beat walking.
Karen.