I suck at motor skills. Trying to move my arms one way, legs another way, and turning my head to breathe is too much for my body to focus on, let alone functioning the correct forms to move. The most I ever swam was half the length of a pool using a very slow backstroke in high school. Going that far took all of concentration and focus. I cant even float.
In addition to trying to learn in both my freshman and sophomore years of high school when it was mandatory, I had also taken swim lessons with I was 9, and failed to learn back then too.