Welcome aboard, I also came across the forum just this year and was happy to find kindred souls (or at least people who understand some of the challenges of OHS).
I self-test my INR (thanks in part to support from the group here) and I've never let being on Coumadin change my activities. I'm obviously more cautious in situations that could lead to broken bones or trauma but still try to get the most out of my post-op life. I don't let it stop me from travelling, hiking, gardening, or using my table saw. The only time it was an issue was when I went skydiving and the site required an EMT be present in case I twisted my ankle on landing. Of course, it's easier for me to say as I never had dreams of horse racing (cars though..) so didn't have to give up a passion due to anticoagulants. Obviously you stayed engaged in the field but I understand it's not the same level of satisfaction.
That being said, personally I did (finally) get my **** together at 29 thanks to the shock of almost dying. Set career goals, bought a house, broke off bad relationships, and found the spouse of my dreams (who I am still happily married to). Now I'm recently retired and moving on to the next phase of my life, whatever that may be.
Plenty of regrets both pre- and post-op but that's life and I can't change the past so try not to dwell on it (again, easy for me to say). We all have our own experiences and anxieties, share and take comfort in whatever therapy works for you (professional or friends or commiserating with strangers on the internet).
No slight to
@pellicle, as I'm firmly in the absurdist camp, but my foundation is more Monty Python than Camus