99 Buick Regal problems

Having problems with my lights, and I need some help. When I turn the lights on the reverse lights stay on the whole time. They stay on when it's in park and while driving. When the automatic lights turn off they stay off. I have brake lights and my blinkers work, however my plate lights are out and the other 4 tail lights. I checked the fuse for tail lights and it was fine. I am stumped and need some help!!

if there is no trailer hook up on your car I would look at the wiring for your reverse lights and for the parking lights for the rear of the vehicle.