Most common questions used to investigate
Is your camera set to full automatic mode?
Are your camera settings on manual mode?
Did you expose your photo using the built-in light meter within your camera?
Was the indicator of the built-in light meter positioned at the center before you took the photo?
Common conclusions
It seems you have a technical problem. Please check your camera in a photo lab.
your photos are over-exposed because you may have not exposed your photos correctly. It is advised to use a light meter to expose photos properly.
Your photos are over-exposed because you have not exposed them correctly. In most cameras, the built-in light meter measures the light in your scene by a scale of -3 to +3. The number-3 indicates your photo is under-exposed while the number +3 indicates your photo is over-exposed. To receive a "correct" exposure it is recommended you bring your light meter to indicate the number 0, which is the "center" exposure between -3 and + 3.
It seems you have a technical problem with your built-in light meter. Please visit a photo lab for further assistance.
References
https://www.miketurnerphotos.co.uk/dslr-cameras-built-in-light-meter/
https://digital-photography-school.com/understand-camera-light-meter-desired-exposure/
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