I was good at swimming until everyone started to grow. The best swimmers are really tall with great big shoulders, and that just isn't us. But then a big, powerful swimmer isn't going to be so good on the bike and the run.
During an open water swim, it's easy to lose your direction. With all the splash, it can be quite hard to see the next buoy, so I look behind it for something bigger, like a tree or a building, and aim for that instead.