dear Reko, thanks so much for posting your comment, and I'm sure it wasn't easy to do so, with the apprehension of not knowing what to expect.
This site doesn't criticise anybody, because The Moderators wouldn't allow for any reply to be posted if someone did, so your safe here.
People have no real choice what sex they are born with, and if people decide to change their sexual beliefs, then so be it, no one can possibly stop you from doing so, and no amount of talking can possibly convince you to be the way they feel you should be, and secondly it's non of their business.
So at the moment you have feelings for both sexes, and that's the way you want to be, irrespective of any sex you may favour towards, makes no difference, because the feeling for both is still there.
Remember that there are males who like to cross dress, and no one can stop them from doing so, and really why should they, that's their own personality, and if you can see these males dressed as females, there is no way to doubt their sexual origin, because some of them look so beautiful.
I am sure that there are many people out there that want to be both sexes, that's their entitlement, just look at Dame Edna and plays the role so well.
Sooner or later your boyfriend will find out or see the clothes and then question you, maybe with the thought that you maybe having an affair, so perhaps you could bring up the topic and sound him out first, if he says that he hates it, then it's your decision on whether you want to tell him, but you have to keep in mind that he may leave you.
It's not an easy decision, but basically I can't see anything wrong in telling him that you are bi, he may in actual fact like it. L Geoff. x