Afraid of forgetting and getting hurt

Hi.. my fear is kindaaa weird..
So like if I'm at a pool and I feel a filter suck on my leg I think "ok don't swim by that you could get your hair caught in it" then I avoid it, when I accidentally do it again get scared and be paranoid about it and start thinking "since I forgot that once it can happen again and I could get hurt" make sense?? Is that normal.. does it have a name or anything?