Woah, 5'5"! You've gotta be stoked to be average biological female height. But you'll probably need to be on estrogen therapy a while to reduce the size of your legs to that of a
bio woman who doesn't work her legs hard. To drop fat, you can do that now (change of diet, exercise), and estrogen makes you lose muscle and put on some extra fat, so starting now would be a good plan. Until then, ...