OP, make a backup of your osu! folder sometimes, because when someday when you realize that it's fucking impossible to get at his level or even close to it, you'll ragequit and delete your osu! folder, and not longer than a week later it will be a really pain in the ass to restore all you songs and return your skin, if you modified it.
Also you have to play 10h+ per day everyday 7 days in a week 365 days in a year. Because there are a lot of other players, who play 5+ hours everyday the hardest map they can for becoming cookiezi, for example me. It means that everybody else is improving, and if you want to be the best, you have to have the fastest improving rate, so you have to play all the time that you have. Skip school, quit job, never go out. Just play and sleep, play and sleep. And then, PROBABLY, you will come CLOSE to him.
But you won't do that, you won't even do something close to that. So forget about it.