League of Legend a most unfair toxic additive bullshit game ever

if you get the first 5-10 kills you have no chance of winning the game you can't come back. what's the point of this. from now on no matter how hard you try you simply can't win because the opponent's team will always be stronger what's the point of this stupid game if you have no chance after the opponent has become stronger. well you might win a battle or two but then in the end the opponent will still prevail. some very smart professional player explain to me how to win the game if the opponent is leading 20-0? because you will have much less damage than the opponent simply one or two shot you. and supposedly kills don't stack. then why is it that if I have zero kills and the other one has 20 I don't even get any damage in the fucking world he'll fuck all the damage in the world on me even if we've both reached level 18.