Try to not be putting an expectation on your healing. We all heal at different rates. It depends on lots of things. At this early stage your knee isn't happy, period. That your able to do steps is amazing to me. I would be using the walker if I were you. You will find you stand straighter and your gait is better with it. There isn't a time limit for using anything that helps you recover and heal properly. I'm just 5 months into revision recovery and when I leave the house I'm using my cane. (Per surgeons orders. And frankly I need it.) In the morning when I first get up I use it until all my parts start to work in harmony with one another. Recovery isn't sitting around doing nothing, its your body recovering. I know I'm sitting on the patio daily and man the sunshine certainly makes me feel better. Maybe try to get some vitamin d. Hang in there, lots of us are on the recovery journey with you.