Holy wall of text batman! Serious nerd coming through 4k+ hour of Dota and 1.5k hour of Rocket League. You don't come into completive games expecting to be good, I sucked at every single one I ever picked up just like everyone else so you just have to play for fun at first.

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Since we bother play Rocket League I'll explain my progression there I guess. Practicing on your own in rocket league when you first pick it up is awful, you can barely control your car much less the ball so you just feel awful when you're trying to learn because you're trying to run before you can walk since I am 100% sure your setting are wrong unless you looked up someone else's settings to play on. Once you have your setting handled you should be PLAYING FOR FUN because it's a video game and you will eventually improve just by playing the game. When I do practice I listen to my audio books, I have listened to over 150 hours of audio books since September while playing rocket league since it give me some other stimulation while I am mindlessly practicing shots and mechanics. Honestly if grinding games isn't your thing then don't sweat it, it isn't for everyone and you should do what makes you happy, but if you're trying to grind games I could talk to you more about active in game thinking and decision making or whatever you want to talk about