I have a girlfriend who really likes me, but I don't like her as a girlfriend. I just want to be friends. (just about everyone who knows me knows we're BF+GF, so If we break up people would be all over me. And Thats really annoying). How can I break up?

(yes my name gives stuff away about me. I have a fetish..., but thats not why I want to break up. please do NOT say that....).