I can't speak for anyone else but by 17 I was through with living with my parents. I had had enough.
I left at 18, lived on my own for 3 years, until 21 when I was forced to move back in due to lack of finances. Moved out again at 22, had to move back, then moved out again at 23, had to move back again, and then finally moved out for good at 24.
If not for money I would have never come back after 18. I cannot imagine living there in that place until age 40
Don't you want freedom? Don't you want to be independent?