I dip my toes into the cold. I leap in with fear. The water is as cold as the North Pole. Why do teachers make a swim… haha. I can see ice cubes at the bottom of the water at the school swimming people.

Show not tell is when you show in your writing whatever you're talking about, not tell. I will give you another example like up at the top.

I was cold

I had goosebumps