Has my injury been holding me back?!

Im a 17 year old boy and Ive been playing the game my whole life and recently about 2 or 3 years ago I injured my right knee first with a hyper extended knee then last year I had a meniscus tear which is finally getting treated with surgery next month.

My question si Ive noticed my skill has gone down by an incredible amount and I try really hard but I dont seem to be getting better

And Ive been using my injury as an excuse for a while now and Im beginning to thinks its just that I suck

is the injury the problem or is it me