Question My pc doesn't show my native resolution

[GeneralMercer]

My pc resolution is 1366x768(as there are black bars at current resolution which is 1366x768) and it doesn't show a resolution higher than 1360 x768 and when i look at videos my current resolution looks worse than 1280x720.how to change it to back ,also i can't do this through amd because it requires many others details for custom resolutions like horizontal timing, etc.please help

 

[popatim]

Make & model # of your Display and your GPU please.