Can anyone recommend me some extremely scary video games, I scare very easily, but I want the scariest you know of

Well, I don't scare at all. I can only enjoy horror games on a gameplay and sometimes story level so I cannot really recommend anything for you based on my own experiences. As for just fun games that are "scary" I'd recommend Condemned 1&2, Resident evil 2, 4, and 5.
As far as I know Amnesia: The Dark Descent (linked below) is supposed to be pretty freaking scary. I haven't been able to play it myself since it is PC only though.
http://store.steampowered.com/app/57300/?snr=1_4_4__13
The only game that has ever successfully frightened me was the Killer Croc fight in Batman: Arkham Asylum.