You're right. Fantasies don't become fetishes unless you act on them. Try not to be ashamed. We all have strange fantasies and/or fetishes - they are completely normal. I would hope that your partner would understand that your fantasies are just fantasies. I am always in support of being honest - it is always the best policy. I am curious to know what these fantasies are - maybe I could help a little better, but I understand not wanting to go there.