You don't. All the games you play are, for the most part, a coin flip as to if you win or lose (unless you have a massive skill advantage over your opponents). Anyone who tells you differently is lying.
The only way for skill to be expressed is through a large number of games, as the coin flippiness of the matchmaking gets evened out and your impact on your games is truly shown.
Or, to put it another way, let's say that in 40% of your games you are guaranteed a loss for a variety of reasons. In another 40% of your games you are guaranteed to win for a variety of reasons. Now in 20% of your games (and this percentage depends on how unskilled/skilled you are) you can have an impact.
This is how people are simultaneously able to climb in rank, while also feeling like every single game is a toss up as to if they win or if they lose.
There are plenty of people that will claim that every game is winnable and that you're just bad at the game. These are false statements and it takes only a modicum of critical thinking to realize this fact, but still people parrot the same "GIT GUD" lines, as if saying that makes them intelligent.
