A childhood belief about swimming pools

When I was about 9 years old I was all into watching shark movies such as jaws and so on. At this time I lived in a mobile home park where my mom would take my brother and I down to the pool to go swimming. Now though I loved learning about sharks and watching them...I was terrified of them! So when we would go swimming I believed that somehow where ever there was water...there could be a shark. (Except of course the bath tub at my house because nothing scary or bad could be somewhere that my parents lived.) so to say the least every time we would go swimming I had this thing that if I went into the deep end I had to be the first one to pass the blue line separating the deep end from the shallow and the first one crossing it to come back or the bottom of the pool would open up and a shark would come out and eat me. ! honestly did this and had it in my head until I was like 12 haha