Eight weeks is still early ... not just early ... extremely early .... I was like you ... I could walk and climb steps, but I wanted to run and dance ... recovery took longer than I wanted. I'm about to post a 16-month update ... I feel like I'm still getting stronger ...
Yes, a few (few!) people feel strong and active at 8 weeks, but the vast majority of us don't. I didn't come off the cane til about 8-9 weeks ... You're simply at that point in the "story" where you are heading through the tunnel, and you are thinking there is light ahead, you're hoping, but you sometimes fear ... maybe there is no light ahead. That can be a totally normal part of the process. To trust that the healing is taking place.
And there is a bit of a curse with having the surgery as we did. As my physical therapist said (I went to her at 6 months), most of her clients just want to walk without pain. I wanted to do a lot more ... The more active you want to be, in my PT's words, the more time it takes for the muscles to be able to get into shape ...
Hang in there. I was almost in a complete panic at 8 weeks (though I didn't always admit that on this board). Looking back, I feel like panicking at 8 weeks is so so so early.