I stopped for gas today and when I went to start my 2011 F150 XLT Super Crew 4•4 it acted like the battery was low, so I get home and park it, about an hour later I try to start it , but it just clicks, so I check the battery terminals and they are good, I go to put the key in the ignition and as soon as it’s in it starts clicking and I haven’t even turned the key? What could cause this??

 

Welcome to the site..

Being a 2011, if the battery is original you'd be about due. A simple state of charge or volts/load test would prove out a battery issue, possible charging system but unless indicated on the panel, dim lights etc, probably not.
When the battery voltage drops off it will rattle the dash relays and the anti theft will cause problems from the low condition...