I knock on wood when I say something jinx-worthy. Like the other day I said something like "My son has never really had a serious injury." (see I knocked on the desk just for typing that, lol! If there is no wood available at the time, I'll knock on my head!) But no, I would not say it affects the way I live my life.
My phobias on the other hand...
So speaking of that, do you have any phobias? I'll go with the definition of "irrational or exaggerated fear" rather than the clinical definition.