@edgarblythe,
[edit: oops, timestamp error ]
I empathize. I.have been (and still are) living around ponds and lakes. I‘m similarly an ‘inefficient” swimmer which makes over-exert myself and makes me anxious. Anxiety makes it worse as I get out of breath more easily. I’d say I can swim 20 - 30 yards or a single length of a swimming pool and then I have to float on my back. Not the worst situation, though. At the ocean, I’ll body surf when there are decent waves or just dunk to cool off and then go walking the shoreline.