brother dont u thing CS is soo mch famous game ... every1 knew it nd i its obvious i hav heard it too and played also .... can u tell me some other game instead of cs go nd other famous games ..... ty 
You could always play goat simulator on lower settings very fun game and there is loads to do.
goat simulator gets boring after short time, and even on lowest it might me too much for 15+ old years computers