Okay tell me the essential things needed to make a fps game.
FOR EXAMPLE:- MAP,ASSETS,GUNS,BULLETS,BUY MENU,TEAM MENU ETC 
(I AM NOT DUMB xD)
Maybe some time to think over what you want your game to be like
You need meshes, sounds, good maps,… 
You will have to be a little bit more specific 
Knowledge of a development engine is pretty critical 
In all seriousness, i think first you need to scope out what you want your end product to be. From there you can work backwards and identify each component you will need to piece together to create that final product.
Just remember, try and keep your scope small or highlight various milestones in your project which you can achieve. This should hopefully prevent your burning out and never finishing.
Have a look at Epic’s “Shooter Game”.
Launcher -> Learn -> Shooter Game