As far as I'm aware, the Auto White Balance setting on most cameras is simply somewhere shy of full, daytime sun. The camera doesn't actually choose. (At least that's the way it was last time I checked. Perhaps the tech has advanced since then.)
The camera's flash is in this ballpark.
So for example, if you take a photo at night, indoors, with incandescent lighting and no flash... you will notice your white walls looking pinkish orange (salmon?). The flash will generally go a long way to correct the color.
The only way to get accurate color is to use the Manual White Balance setting. You set it to a bright white sheet of paper in the same area as your subject... then shoot.
Still... I would think that if you turn the flash off and use AWB, you should still be able to capture a color difference, though the colors themselves may not be perfectly accurate.
As a side note... all those years you thought you were a great photographer and now you get weird colors with your shiny new digital camera. Must be the camera, right?
Well... the fine folks developing your film were correcting for color all along. And now it's up to YOU to perform that operation. Learn about white balance and you will take better photos.