My dad keep wishin and hopin i die and wont live till i get 18. any advice??? im only 15?

my dad keep tellin me ima die and i wont live to get 18 and my mom says yep everytime he says that to me. and he be hurtin my feelings when he tells me that stuff. like i can be playin with my dad and he will get crazy. i dont know what to do. my mom dont say nothing to him when he talks to me crazy. i dont understand why my dad keep tellin me that i wont live and somebody at school gone kick my a**. i dont go nowhere i dont get in trouble at school. i got nice grades my conduct is all E's and he still tells me that everyday.well my dad is a drunk and he be sneakin beer in to my mom house drinkin it. and when he does that the situation gets worse....he lies on me and steals from me. and my mom let all of this bullshit happend.....im 15 and i dont know what to do....im tired of it. any advice