Glad for you for overcoming that. I have had my own challenges over time. When I was 5, I nearly drowned in a lake - someone threw me in as a prank. I never entered water deeper than a bathtub for decades. As an adult I said Eff that, and decided to make my peace and learn to swim. Six weeks of lessons before I put my face into the water, weeks more before my whole head, took me about 2 years of lessons and practice on my own to get over the "pit of my stomach" fear every time I put my goggles over my eyes and started that first stroke. Eventually, I even did about 15 months of a USA Master Swim program.

You need to commit intellectually to overcoming it, and then make it happen.