I thought I couldn’t swim but then I can swim. What happen?

So I went on a date to the pool with this guy I been seeing for about 2 months. I was freaking out about going to a pool because I thought I couldn’t swim. I actually should know how to swim because growing up they taught swim in p.e class, and my parents always took us to the pool in summer. I always remember almost drowning and my step dad pulling me out the pool. I also remember being thrown into the pool by a instructor and then going all the way to the bottom then she pulled me up. Lol Now fast forward years later I thought I couldn’t swim. My date says cup your hands like this when you doggie paddle then I did and next thing you know I’m swimming all over the pool. Then he taught me two other ways to swim and I did it. I was so happy I could swim and he was tickled and said Your doing it girl. 😂😂😂😂😂