I believe this to either be a birth defect or a serious psychological problem. If you like either of these things in a sexual way I suggest you find help somewhere. No one will like you if you tell people beyond the internet.
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You don't know what you're talking about. A foot fetish is the most common fetish and is the result of a small mixup in the brain. Your brain has all the body parts of the opposite sex mapped out, and on this map the feet are right next to the genitalia, which can result in the brain confusing the two. It is not a serious disorder, no fetishes are. Also I have met many girls willing to indulge a foot fetish disproving your last statement.