Can't run my favorite game, because EVERYTHING IS LOCKED

I just installed the game and I wanted to play my favourite GP with my favourite kart, but I can't.
When choosing my kart, it says: "Locked: solve active challenges to gain access to more!" What challenges? I know all the tracks well and I don't want to play all of them right now. Why should I? I play this game for years, I already solved all the challenges million times before and I just want to play my game.
When choosing a difficulty, I want the highest, because it's the only options for me that makes me lose at least sometimes. You know what? I CAN'T, BECAUSE IT'S LOCKED! No explanation WHY.
So when I choose the lower difficulty, half the tracks are LOCKED - "solve active challenges to gain access to more". Thank you VERY MUCH for not allowing me to play half of the tracks just because... WHY?
I wanted to play my favourite GP. But I can't because ALL GPs ARE LOCKED WITHOUT ANY EXPLANATION.
PLEASE REMOVE ALL THE LOCKS FROM THE GAME! I know you spent lot of time developing the STORY MODE, but what you do with the locks is just pissing off the people who really like your game.
When choosing my kart, it says: "Locked: solve active challenges to gain access to more!" What challenges? I know all the tracks well and I don't want to play all of them right now. Why should I? I play this game for years, I already solved all the challenges million times before and I just want to play my game.
When choosing a difficulty, I want the highest, because it's the only options for me that makes me lose at least sometimes. You know what? I CAN'T, BECAUSE IT'S LOCKED! No explanation WHY.
So when I choose the lower difficulty, half the tracks are LOCKED - "solve active challenges to gain access to more". Thank you VERY MUCH for not allowing me to play half of the tracks just because... WHY?
I wanted to play my favourite GP. But I can't because ALL GPs ARE LOCKED WITHOUT ANY EXPLANATION.
PLEASE REMOVE ALL THE LOCKS FROM THE GAME! I know you spent lot of time developing the STORY MODE, but what you do with the locks is just pissing off the people who really like your game.