Even if researchers do not agree as to how fetishes evolve, it is fair to conclude that it is a mixture of nature and nurture, awareness and fascination.
You could have had a defining moment that contributed to your taste in sex, or maybe you’ve taken an interest in excitement and adventure.
It might be enlightening to uncover those origins without criticizing yourself, but it would be more rewarding to learn ways to make your wildest fantasies come true.