Hey there,
I'm sorry to hear about your injury.
I am no expert on cartilage damage sadly, but my instinct would be to say that returning to soccer 4 months after a surgery seems a bit early - were you cleared to play by your physio/orthopedic surgeon?
I would definitely consult with them before playing again. Before your physio appointment, try to take it easy - rest, ice if it helps with the pain, no high impact sports etc.
Ask your doctors their opinions on when you can return to playing soccer! Try to remain positive and definitely be patient, I know how frustrating and depressing it is not to be able to play the sport you love so much.
Hope you feel better soon!