Okay, so I have my radius set to 3.6, and the collision bounds are set to cube. I would like to know how to make the collision bounds cube taller. The circle around the character is too wide. So how do I make it less wide? (Or just a solution to this problem.) Because my character can’t go through doors.
I generally keep the radius around 1.5, but if the character sinks through the ground, I lower his origin by moving the mesh upwards in edit mode. It’s not a perfect solution, because the top part of the character will be more likely to go through objects, but it’s better than having him sink.
Thank you once again! 
No problem!