I feel I swim fast when no one is around.

All those years that I got so many tips from swimming coaches in the university and in the high school. So, all those years, I thought I was learning something useful and I thought I was swimming fast when I was all alone myself. But, all those self confidence immediately vaporizes when my wife swims next to me. She learnt how to swim 10 years later than I and she never had a coach to help her. Yet, she just zips through by me when we swim next to each other. What a feeling!!