Ah I had been in an all-girls school for quite some time, really stressful it was indeed o~o. Well the advantage is what
>>2 said, no boy distractions, being more open, etc. But I reckon there are a lot more disadvantages in the social context.
Girls make groups and these are strict, if you don't settle in fast you are (partially) doomed. But if you're not true to yourself as you join a group you're killing yourself inside then. You don't need to be generic if you don't want to be, on the first day or two you have the advantage of talking to everyone before you settle in so make use of that.