You're not a downer, you're a normal human and you HAVE been recovering forever... well, six months. Six months is twice as long as I've been recovering, and I can only imagine how wearisome that must feel. So of course you will feel a bit stretched out on the patience meter. Rumor has it there's patience to be found in a red box under your bed. Some people bargain with their knees (I know I have) but there's no proof that works very well. Knees just do what they want to do anyway.
You really are back at the beginning with your right knee, and very early in recovery. On the plus side, you are sleeping well, and your pain is under control, and you know things will get better. Can you look forward to the fun things you know lie ahead? The exercises you enjoy... the adventures you will have... the freedom that will come when you, finally, at long last, have no pain? Oh, and you have friends here who will nod at your rants and understand exactly where they come from!