Everyone's knee feels different coming out of surgery. It may sound strange, but sometimes the joint needs to "work out a few kinks" as it's healing, so don't be discouraged about having some lingering pain. I'm sure your surgeon didn't miss anything in there so I wouldn't be concerned that something is wrong.
Like someone already mentioned, work your ass off with the rehab. I highly suggest also going a step further and doing some intense strength training after you "graduate" from PT. I went through an ACL Prevention program after my first one and it made a huge difference. I'm 3 weeks out of my other one getting fixed and I can tell it feels way better than the 1st one did just from focusing on even the simplest exercises.
Aside from rehab, the best thing you can do is keep a positive attitude and a strong mental game. Don't get caught up with how long it's taking or trying to follow a timeline, just know that if you put in the effort, you will get to where you want to be. It took me over a year and a half to begin feeling confident on skis again. Point is, base it off how you feel, not how you want it to or think it should feel.
Feel free to PM me any other questions, after 3 knee surgeries I have plenty of advice to give haha