tw/p hit the nail on the head again.
And with the back-talking thing... yeah, that's what I get burned with too. A lot of times I won't even realize I'm doing it, and then I'm grounded. It's frustrating, but it's something I work on, too.
A quick break like that may eleviate stress in the household - I agree with your thinking there, Bunny_grl. Sometimes you just need to
get away, and I understand that. But, as tw/p said, that's not going to solve all of your problems.
If you ever
do go to a friend's house for a week or two, talk to them about this. Use the time for self-reflection. How can
you impact change on your household when you go back? You can't make your mom cooperate more or your younger brother be less annoying - the only person you can change is yourself. And believe it or not, being more pleasent and caring yourself will usually domino to other family members, making for a pleasent atmosphere.
Leaving temperarily may put some things into perspective for you too. It may make you realize how important your family actually is to you, and how much you need a stable, supportive homelife.
If you don't get the opportunity to leave, you can still think about these things at home! Just take some time out every so often to calm yourself down and don't forget to look to the big scheme of things.
So I think that it's okay to get away even a night or a weekend... but don't make it a habit, because nothing is going to get better that way.