Torn Major pectoralis. Or will it help?

I am 25 years old. I had an accident around 6 years ago and my doctor told me that my pectoralis major muscle is torn due to trauma. He told me that I would have reduced strength if I don't go under surgery other than that there would be no issue. As I used to play football I didn't bother about the loss of strength in my right arm. Now back to the current day, I am out of shape as I quit football a few years ago and now I want to get back into shape. My pecs are asymmetrical(right pec is "bigger" than left due to torn muscle ). So what I want to know is that is there any way I can make them symmetrical? Will losing fat help? If I do push ups and lift weights will my pecs become more asymmetrical or will it help? Any help will be greatly appreciated, I am really worried.