Someone touched on this a little earlier, and I just wanted to touch on it again. It seems like moving out and "making it on your own" is a very "American" thing. Not to say that it is good or bad, just unique. I know that when my family was living in Russia (I was about 2 years old), me, my parents, my mother's parents, and my mother's grandmother all lived in the same household. My dad's mother had her own apartment. And it was very much culturally acceptable for multiple generations to live under the same roof. Perhaps it was the lack/availability of housing, or perhaps it was a cultural thing. But, that's the way it was. I am in my early 30's and live with my girlfriend, but I remember having a conversation with my mother once regarding this "urge" to move out. Our conversation ended with the idea that unless someone was in a "serious" and stable relationship or married, that living with their parents was completely acceptable. Obviously this includes the caveat that everyone contributes towards the household and "does their fair share".
That being said, if I needed it, my parents would welcome me (and my girlfriend) back with open arms.