How did I become bad at this game?

Lately, playing online I lost a lot of points. I was on the 34th place (2nd page) in the ranking and now I am on the 44th place(3rd page). I gave everything I could to win the races, but even if I wasn't on the last one (maybe I was on the penultimate place) I lost points. Maybe one day I'll recover.When I will recover I will lock this topic.

That's the game.
Sometimes you win points, sometimes you lose them.
At several times I passed a certain number of points before falling lower (like when I passed 30000 points or recently with 38000 points...)

Thanks for the information.

Welcome to the club
In all seriousness online leaderboards just work like that. You gain points if you win, and lose points if you don't. Sometimes you run into a cold streak that just sees you lose like 15 of 17 games that day, other times you get a miracle run and win those 15 of 17 games. It's part of the unpredictable nature of online multiplayer.
It's best not to give the points too much importance. I've been in that spot and it's created nothing but anguish on my end. I mean I can't stop you from giving the points importance, but it's best if you don't, in my eyes anyways.

It happens. for example i used to be top 10 on this game but i went into a bad streak and lost top 10 and then i became inactive

That's online ladders for ya. Be glad it isn't as bad as PS where your rank just falls for not playing every day(I think).
And, losing builds character. Or something. Just keep trying. You got a high rank once, it stands to reason you can again. Everyone has an off day/week.

Well you gotta be the best, like no one ever was to get to #1

You win some and you lose some

Thanks for the informations, guys