The setting is more like the real world than marvel universe.
Powers are not common. Your characters donīt know others with powers. You have heard of people who can do unnatural things like Sigfried and Roy, Houdini, Harry Dresden etc. The public think these are only stage magicians but you suspect they are like you. Something more than ordinary human.
There are powers in the world. But most of them keep their powers a secret. Think "Men in black" - 'No you did not see a man throw a truck. It was a gas leak in the street and the explosion throw the truck. You didnīt notice the big cloud of flame and smoke?'
The goverment have a secret unit for hiding the precense of power for the public. And Area 51 is for holding and research of people with powers.