Help understanding pixel size

Ok, I'm not the smartest person in the world. More accurately, I have a very hard time understanding when someone explains things to me. And I just cannot understand pixel sizes. What the heck is the difference between 16 bit and 32 bit. Is there even a difference? How is image size important? Why does a 384x384 image and a 272x256 image have the same sized pixels? Especially when one image is in 24 bit and the other is in 32 bit? Is there something I'm missing? Is there an easier way someone can explain this?