can't ever sleep

Everybody is always fucking fighting at my house and I can never sleep. I'm a senior in highschool and I got to get my sleep but everybody is always yelling and wakes me up. And when you wake me up by that I'm super fucking pissed. Like tonight my step brother was fucking yelling for no damn reason and it woke me up. I just want one night of decent sleep but it'll never happen will it? :( I wanna move out but I'm only 18 and can't afford to live on my own. What do I do :(