IF you get married then you are no longer illegible for immigrant with your F4 petition and if you married and misrepresentation of facts from DOS then you can be ban which ever stage if they found even after Geting visa or brfore.
if you go to US with F1 study visa then there you can adjust your status by submitting I-485 WHEN YOUR pd TO BE CURRENT.
SO WAIT AND be calm your VISA number will be available after 12 years. its mean at June 2014