Well if the girl at least talks to you that means she can at least stand you, but thats very, very, very far from her liking you or wanting anything to do with you. Most girls if they're rejecting you for an offer for a date (unless they're a complete *****) will try to do it in a nice way by saying that they're busy. However, this is counterproductive because some guys still hold out hope of getting with these girls. If the girl hates and you and rejects your date it would probably go along the lines of "Mystic, you are the biggest (insert adjective here) I know"
Bottom line is man, if you even wonder if this girl is grossed out by you then you probably don't have any business asking her out in the first place.