"...down and discouraged..." are not...repeat NOT...options for a TKR patient. Yes, it may be normal to feel that way but you have to slap the crap out of your inner child and put your big boy/girl pants on.
Correct...you will never be the same. You now have a two pound cobalt-chromium and plastic mechanical device implanted in your body. What do you expect? No more downhill skiing, singles tennis, or, in my case, playing league hockey. Find something else to occupy your time. How about competitive needlepoint?
Eat healthy, lose weight (if necessary), hydrate all day, take PT very, very seriously, endure the pain, take your meds, do the exercises, don't lie in bed all day, hit the gym to rebuild your quads, do not compare yourself to anyone else.
When you feel like sitting on the "pity pot", get up and go for a walk. The choice is lie to in bed, complain all day, let your muscles atrophy and die ...OR... walk again without pain and lead a normal life. Your option. If you like the latter, then NO EXCUSES...DO THE WORK!!!!
You do realize that 50 years ago we'd all be in wheelchairs for the rest of our lives...right? Be thankful that the technology and ortho skills exist that will allow us to walk again with no limp, no cane and no meds. I, for one, am very grateful.
Yeah, get angry, get pumped, get psyched!!! It's a challenge...overcome it!!! Dig deep and find your core, your balance, your strength. Kick some serious a$$!!!
"Never give up. Never surrender." - Tim Allen, Galaxy Quest