I took it as concerning when I first got my diagnosis, as you would appreciate. I, too, am a life long athlete, outdoorsy, etc. And physical. But I read a ton and learned that AF is not a lethal disorder. It won't kill you. It can, and often does, lead to other problems, opportunistic conditions, that take place if AF is left unmanaged and runs on into permanent AF. So the idea is that you should control it and keep it at a distance as much as you can. It might be a good idea to rely on medicine for now, or it might be better to consider the gold standard of care known as a catheter ablation. I have had two of those (the failure rate for a first ever, or 'index', ablation is about 25%, which means the electrophysiologist has missed an area and the signal is still getting through to the atrium and causing it to beat chaotically).
AF is 90% probably found around and just inside the mouths of the pulmonary veins. When first diagnosed with paroxysmal AF, which is what you have (comes and goes on its own, no intervention needed just yet), it is most likely around the pulmonary veins. If you elect to get the ablation, and an EP agrees to try it on you, the chances of success are considerably higher than if you are in persistent, long-standing persistent, or in permanent AF, the next three stages in order of their appearance and diagnosis.
Lifestyle alterations can help. Losing weight, improving sleep, beating stress into submission, changing diet and other habits that might not mean weight gain or loss, but improve nutrition, getting more magnesium in the diet, sometimes ingesting less calcium helps for some...it's really quite involved once you start your own reading and figuring out where you'd like to go from here. I did lose about 20 pounds, but it didn't slow the progression of my disorder. I am not a big user of alcohol, maybe one or two drinks each week. Never two drinks of any kind, beer, wine, or scotch, in a row.
So, the upshot, for you, is that you are early in the 'game'. You're paroxysmal, and this is the early stage when generally there are more options and they tend to work more readily. You don't want to be in AF long at any one time, never for more than 24 hours with an HR above 100 (this signals RVR, or 'rapid ventricular response', which you can google). If you can honestly say you live well, low stress, decent sleep and diet (corrected as needed, especially with the CPAP), and you feel you're losing ground, get into the books of a good electrophysiologist (EP) and see whether he/she agrees that it's time to take a considered look at your case and whether an ablation is indicated.