I'm thinking of becoming a fetish model and hide it from everyone I know
Why a fetish model of all things?
I've always dreamt to become famous and wealthy
It sounds like you have a plan. It's okay if you want to keep your sex life private from others, but just realize they may find out if you become famous.
I'm going to do it anyway. Oh and my close friends know about my sexual tastes.
If you are comfortable with yourself to do that then I say go for it. You don't need to tell anyone if you really don't want to.