Movement not working when physics enabled

hey, new and learning UE4, as the title says I am having problems with my character, it’s a 2D paper character and movement was working fine with WASD however as soon as i turned on physics it stopped working, I turned on physics cause I am making a 3D world but I suck at drawing and animation so making the characters 2D. Can anyone help as to why this might be? as I said it works fine without physics so I think it is somewhere in my speed or friction settings.