Not every patient has a perfect recovery, no matter what kind of surgery they had, whether knee, heart, hip, and so on. But, we hope for the best and do what we need to do to try and take our lives back. Many more people have a good outcome than a poor outcome, but many of those who do have a slow start in recovery go on to recover well and move on with their lives once again. I'm one who has a rough time after surgery so it takes me longer to get through the first phases, but at some point I hit my stride and my recovery goes a lot more smoothly.
There are many ways to help with post-surgery pain; I can't take any pain meds so had a nerve block in surgery with my revision, 2 full rounds of the On-Q pump after it wore off, and then used an ice machine and elevation after that. If you can take narcotic pain meds to relieve pain, and then taper off as the pain tapers off, you won't need to wean yourself off them. Those who take them for actual pain don't generally get addicted, they take them for pain and when the pain is gone, so are the pain meds.
Your knee issues won't get better with time, and will continue to get worse, which may make your recovery harder. My advice is learn everything you can ahead of time so you're as informed as possible. Have a plan for your recovery, such as meals, recovery aids, help, and so on. We have a good post about meal prep before surgery in the social room; take a look if you're interested. We also have a ton of information between posts and our articles in the library. All can be a great help in preparing for your surgery and recovery. Don't let your nerves get the best of you, getting the surgery done and behind you is a good thing.