Well...I haven’t broken a collar bone. But, I did need to have surgery for a torn rotator cuff several years ago in my early 50s. (And have had numerous other sidelining injuries/surgeries.) As an avid swimmer obviously that meant I’d be out of the pool for a while. When the doctor and PTs finally allowed me to resume swimming I went at it slowly and gradually...like I was a new swimmer. Eventually I was swimming as fast, or faster, than I had pre-injury. It’s a different injury, but I tell you this just to point out that it’s not the end of the world. Let yourself heal. Recuperate and listen to the doctor and PTs. You’ll be good as new in no time. Good luck.
Dan