Weither this story is true or not you need help, more help then anyone on da can give you without a hot branding iron. See a Shrink or a Priest, or both... unless your catholic then you might have another tale like this on here.
um.....theres plenty of brothers and sisters that have done that b4. sometimes u cant help but to get a lil bit curious. just try to put it behind u. i no it mite b hard but i no that eventually ul b able to. i had this huge crush on my cuzin win i was lil but eventually i got over it. hope u feel better about it! holla if u need anything