Firstly It diesnt matter wether your a crossdresser or a futer transexual or any other kind of person.
what matters is, you do these things and you want to know why, but the answer to that is closer to the reasons you have a favourate food, or like a perticuler activity.
when I make a choice, i step away from gender, ive found that focussing to much on guys are like this and girls are like that just adds to my confusion.
what helped me clear my head, was instead of looking at my behaviours and my likes and dislikes as girl things or boy things, I started looking at me as a person.
Example,
itstead of, I like these jeans, but there girls jeans, why do i like girls jeans.
It was easeyer looking at it like, I like these jeans, why do I like these jeans, because these are the jeans I like.
somtimes, My sister askes me things like, why do i still play vedio games, if i want to be a girl.
I tell her, I play games because I like playing games, and its not about being girly, it about being me.
my long hair
my nail polish,
my heel boots,
the clothes I like,
my perfumes
my vedio games,
and my not likeing to have facial hair,
in addition to evrything ells about me.
their not girl things, or boy things, there me things.
When I was about your age, I did pretty much the same things.
what matters is what your comfatable with as a person, and if wearing bras and panties under your clothes is enough for you at this time??
do you need to start doing other things?
If you do, you can achieve some other things without having to go all girly with them.
Example,
you say you would like to get your ears pierced, you can get your ears pierced without having to have girly earings, you can get, some basic studs, (gender neutral earings)
and then if you ever feel like you have to have girly ones, you ears will allready be pierced.
(if that is what you want)