5'6", and I'm actually taller than the other trans guys I've met, who tended to be more like 5'4", 5'2". Even so, I'm still the shortest person in my family, boy or girl. I know height isn't everything. Both my brother and sister are well over six foot and both of them have problems finding clothing, or even folding themselves into seats designed for smaller people. Neither of them will fly if they can help it simply because their knees are practically under their chin unless they pay more to escape from coach.
Don't worry about it too much. There are plenty of short guys walking around, cis and trans.