Hi girlnextdoor1985,
Sounds to me your about ready to tell, at least your close friends, and perhaps they deserve to know. The trick, as you say, is how? Your friends haven't picked up on the hints, which means they're not taking the lead, which is what you maybe want. Have you tried low waist girly trousers with high waist knickers. That would not be a hint, more of a signal to ask.
If you haven't done so already get out there and tell them. I did it about three weeks ago, not with trousers and knickers, just words, I waited and wasted many many years. Whatever the response at least you'll have got it out, and it is a big (massive) relief. And it sounds like they'll be extremely supportive, which is even better.
GabbyC