Turning 21 - do I have to convert to F-1 from H-4?

Question details

My father is on an H1 b visa and his employer has filled for his green card Me and my Family are on H 4 but i am about to be 21 and thus my h4 visa cannot be renewed.I-140 of all the members of the family has been cleared but we cannot yet file I 485 as the priority date is not near. Do I have to convert my visa status into F 1 so that i can live and study here? Is there anyway that i can file for my green card as when i filled my papers i was not 21 and it is because the file is pending i cant put forth my 485 papers. Is there any chance that under special cases like mine we can get my papers filled as I am about to transfer to a University and it is very hard for me to afford to pay the fees as an International student when my papers are so close to green card.

ANSWER

 I do not see any way around filing an F-1.

Green Card