@davidnjoku also white walls are bad! If it's any consolation, I think there might be manual exposure in the camera settings that you can bump up. But if the exposure looks bad (it will likely overexpose the white wall), using a mid or darker background may help, like a bookshelf with books or something. Sometimes it can also help to throw shadow against the wall or by reorienting the camera so the rear wall is farther from foreground light. Basic cameras without HDR have a hard time in general.