when I try to shut the car off it will not turn to the off position.

Copy and paste the link below: http://repairpal.com/ignition-key-stuck-due-to-failed-shifter-482 On this page see > 2000 Buick Regal Problems > Key stuck in ignition lock cylinder.

Could be a faulty ignition switch, could be fuel related, several options, best bet would be to let someone check it out with a precise diagnosis. If interested, Brotherhood Garage would love to check this out for you.