離家出走!!!!

It is more common to translate 離家出走 as "run away from home."

個情景as you described may be:

呀A has a very abusive mother/father/parents. 呀A could not stand it any more (頂唔順). Therefore, he ran away from home to stay with a friend.

Hope it helps.

A's mom and dad (or parent) are bad. A doesn't like them, so she/he ran away from home to find other people.....

p.s" 好衰 in chinese can mean a lot of things....if write in english have to be specific. why 呀媽呀爸好衰? they hit A? they dont go to work? they dont care about A??? etc..."

離家出走英文係wayward任性的;剛愎的,倔強的