Seems like your real problem is just getting used to the First Person perspective.
Perhaps a frantically paced shooter isn't your best idea.
Since you seem to have access to a computer, look into getting a copy of one of the Thief PC games. They're first person stealth games which means they're very different from shooters and much more challenging in many ways. They do a very good job at putting the player into Garret's (the main character) shoes.







