With the built in systems this is the results you will get unfortunately. So how to fix it? You will have to make your own blueprint or c++ code and possibly use some sort of collision capsule radius on the camera itself. And set up some rules, but this can make also for confusing player controls if the movment of the character relies on the direction and rotation of the camera. You could fix one thing and break or make something annoying on another. Search google for slme camera control tutorials be a good place to start.
I would look and paste some but its best you look and choose as you want something specific