try starting with hi, how are you? then casually suggest going out for a drink or something, or a movie. If you dont ask, the answers always no, go for it :)
no offence but this is beyond weird, and your girl is obviously of the mind that she is in control. tell her straight out no. whats she going to do? force it down your throat? be a man, stand up to her.
each to their own, but in my opinion maybe you should keep an open mind about these things, you would be surprised how different positions can be pleasurable for both of you
i think its incredibly sweet, and so refreshing from most guys today. Seriously, don't doubt your decision to wait until after marriage. Its her loss, and the right woman will be more than happy to wait.