ACL tear

Hi all i was playing volleyball and landed awkwardly. After i landed there was no pain on my knee or any popping sound but there was swelling around the knee and i was able to walk without any pain. This happened 4 weeks ago now the swelling is gone and there is no pain when i walk but i went to the doctor to just make sure and he said its an ACL tear and needs surgery. I am not sure i can trust the doctor because i feel no pain at all i can bike i can run on treadmill without any pain (speed 5.5) but there is only a minimal pain on the outer side of the knee.

any suggestion on what i should i do next or can anyone let me know if there would be pain after an ACL tear?

Thanks