Yep, socialization is the key.
There are definitely distinct protocols for conventional male and conventional female bonding and a lot of women apparently actually feel more comfortable with the male protocol and therefor stick to boys instead of searching each other.
I think you should of course totally ditch any protocol that doesn't suit your needs, but I'm going to mount a bit of defense for the female standard protocol anyway. (Not everything is completely damaging and fucked up about a typically feminine socializiation).
1) the expectations to actually take your friends' feelings into account without them constantly having to remind you of their existence.
Yeah, that "having to pick up on subtle cues"-thing can be a bit of a drag. I wasn't exactly born with that gift either. Frankly, I almost suspect most women aren't. It's something you have to learn the hard way, making a lot of embarrassing and possibly painful mistakes on the way (but you can't learn from mistakes if you don't feel the consequences). It takes a lot of effort. But it's so, so worth it. (Especially if you consider yourself a writer. Writing is so much more powerful, if you also know how to make use of the space between the lines).
It's just such an incredibly useful skill to have, not just for the purpose of a girl's night out. Firstly, because even people with a reputation of being blunt and straightforward shouldn't always be taken at face value. (What use it is to you if he's honest with you, when he's not honest with himself? ).
Secondly, the whole "implicit vs explicit communication"-divide is not just gendered, but also generally cultural. Even if it were true that men are universally blunter than women (which I find questionable), the Anglo-American idea of bluntness is still rather different from the Austrian idea of bluntness is still very different from the German idea of bluntness is still very different from the Japanese idea of bluntness, etc.
I was taught in college that the Japanese have a so called high-context culture, where most of the meaning has to be inferred from context. So if you feel you can't be BFFs with girls, because of the walking on eggshells problem, that probably also means that you can't be BFFs with someone who was raised in Japan. (Now I just wait for someone who's actually from Japan chime in and tell me that's a total misrepresentation. It was
a very introductory level cultural studies course, so I wouldn't be too surprised about getting it wrong. So, maybe sticking to something I have a bit better insight into: Germans couldn't be friends with Austrians either according to that paradigm, because Germans tend to be a bit blunter too. And that's actually a reason sometimes cited by people for certain Anti-German resentiments where I come from and I think it's utterly ridiculous).
Learning to switch between more explicit and more implicit communicative styles is not just a matter of gender relations, but also of intercultural competence. Why would anyone miss out on a chance to train that kind of skill? If you only ever talk to people who speak the first language you happened to learn, you'll really limit yourself in the worst kind of way.
And I say this as someone who usually errs on the side of bluntness. I pride myself in having made quite a bit of progress in that regard since my days of teenage-misfit-doom, but I'm still often too self-absorbed to pay enough attention and therefor continue making my fair share of faux-pas. But that's the thing, with gender relations as well as with intercultural competence - it's really, really not about never making mistakes. It's about how you deal with those mistakes once you become aware of them / allow yourself to become aware of them. (And that's actually not that hard, even if people won't tell you directly. But they might complain about someone else who does something that bothers them and if you actually listen to them and think about it, you might realize that it's something you're occassionally guilty of yourself. And then you say, Sorry, I sometimes do that too, don't I? - and they will of course deny it, so that you can save face, and you will train yourself not to do that thing again and voilà, the issue is resolved, instead of becoming something the other person constantly has to nag you about or grudgingly tolerates about you, a festering sore of simmering resentiments. And of course everything would have been easier, if the other person had told you outright, but see, some people have a really, really bad experience with telling other people what bothers them about them, and it's a huge source of anxiety for them, so they postpone it till the last possible moment, when they really can't stand it any more and if you learn to catch that kind of thing before they are actually driven that far, that will improve so many of your relationships, so, so much.)
2) the sharing secrets thing.
I can see why so many people feel uncomfortable with that. I think it's totally possible to get round that expectation though. As I said, I have a couple of female friends who don't like that either, and I totally respect that. You don't have to if you don't want too. I happen to like the female-bonding protocol, but I won't insist on it, just because you happen to be female and if I can switch to male-bonding protocol for a guy, I can certainly also do that for you.
I think everyone should strive for a certain flexibility in that regard.