I got into triathlon as a swimmer and a runner. Cycling, once I really got into it, became my favorite. While I may or may not do anymore tris in the future, and a friend is currently pushing me to do more, I have gravitated towards doing bike tours. I have done the Blue Ridge Parkway, Colorado, Greater Yellowstone x2, Ireland, and am planning 9 days in Great Britain (LEJOG) and a week in norther Spain. I enjoy it more, meet some great people, and it gives me a reason to stay in shape. I do a little Krav/Muay Thai/kickboxing to balance out my training, but mostly I just bike now.
I try to remember that life is too short to fit a square peg in a round hole. I try to find what I can do that I enjoy. I still enjoy swimming, but a chlorine allergy I picked up late in life pretty much ruled that out for me. Rather than struggle to make it work, I just move on. YMMV.