most of polite boys are having the same problem as yours.so you are not alone.actually you had the guts to tell this to us,which many guys even can't speak with others.so I think you can eazyly solve this.you know your side is possitive about her.but LOVE must have both sides agreement.you must check out for her situation,if she available or what?.if she is available,I dont think you should wait anymore.just wait for the best time and enter to the subject.go straight and ask her.it will work.good girls never ask but good guys do.All the very best brother.go ahead.