stop player when it hits a wall 2d

hello, i am new to this whole ting and really want to get into it so this may sound dumb. i have looked up it and am probably looking in the wrong places. I have a hexagon and it hits square walls, they both have ridged bodies and colliders. when i hit a wall, it not only pushes it, but changes to rotation of the hexagon so it moves up and down from the old top. it would be nice if there was a ways so the hexagon could not rotate and for the walls to stay there. thanks!!