how do I fix the metal thing that messed up when I try to close the driver side door?

Do you mean the latch on the back of the door or the metal bar at the front between the two hinges?

yes.

Sounds like your latch is shut. Get a Phillips head screw driver and pull on it as you hold the handle in the open position. The opening should be pointing at the car. When the latch hits the bale that's bolted to the B pillar, it rotates down and is held closed. It sounds like yours is down with the door open.