Well, typically exposure is controlled by three things. Aperture, shutter speed and the ISO (sensitivity) of the film or digital sensor.
The aperture is the size of the opening in the lens. It is adjustable and represented in F numbers. The lower the number; the bigger the opening.
Shutter speed it the time in which the image is recorded. Your camera probably doesn't have a shutter but the sensor will record the image for a precise amount of time that would be the same as a shutter opening & closing.
Digital cameras usually have a few ISO settings that correspond to typical film speeds. 100, 200, 400 etc.
Try your camera in different modes and with different settings. Try aperture & priority modes and set different values. Try manual mode if you have it. Try changing the ISO setting.
Some digital cameras have trouble with highlights (very bright areas). Maybe it's that your scene has some areas that are mid toned or dark and the lighters areas are just getting blown out. A camera can only record a certain range of light values. Digital sensors are typically not as good as color film. You have to figure out what the camera's meter is doing and which part of the photo that you want to be properly exposed.
Or maybe you camera is acting funny and need repair. Maybe you could post an example.