Front Seat Belt problems of the 1999 Chevrolet Camaro

The driver's seat belt does not fully engage, but appears to be fastened properly. I have had many different occasions (more than 10) in which I fastened my seatbelt and began to drive away and the seatbelt popped out of the receiver, or even arriving at my location, and before I un-snapped my seatbelt, it came loose from the receiver. The seatbelt light was not on while I was driving, but the seatbelt apparently was not engaged properly.