I can sympathise with the all-girls situation... IMO if you don't get out of your "bubble" (as you have so nicely called it) at this opportunity you may never get the courage to escape from it another day.
The independence that comes with moving away with home is very important. We all have to learn not to be dependent on our parents, because, to put this very bluntly, they aren't going to be around forever.
Remember that home will always be there to go to while you're at uni, you may be 'leaving home' but it doesn't mean that you aren't part of the family anymore, and it definitely does not mean that you are not welcome back.
It's better just to go for it. Face the real world now, because it'll happen sooner or later. (although I'm not surewhether going to uni = entering the real world, but it's the first step). Make it your decision, not someone else's.
Good luck ^^