why do i need 2 sit in a 30 min game if i know its a lose

why do i get leaver buster when i leave a game when i ask 2 ff almost 50 times and i am stuck with a bad score and a bad team not having any fun but 3 people wont ff. i literally called a lost at 15min and guess what we lose every time i say ff we are gonna lose we end up losing but we lose at 30 min its annoying just let me leave and get into another match.

im not saying im good. i just dont wanna play a game im doing bad in its not fun.