Fiance Visa - K1/ K2/ K3/ K4

I have been dating my boyfreind for 2 years he is from Jordan. We had met when i had lived there (for 2 years and went to school there) we have been apart for 1 year now, i visited him this past summer and we have plenty of pictures from before i moved to the US and when i went on vacation there, i also have pictures of us with freinds in jordan, my mother and his parents, we have only 1 receipt from when we went to the dead sea (i wish we had gotten more, but we were to wrapped up in having fun) I also might have my ticket stubs, OH and my $1800 phone bill from the first month i moved back to the US... I know that is plenty of proof, but i am scared because we are both young i am 18 and he is 23. His brother is a US citizen and his parents have greencards, but i am still scared that they will not accept it, especially because he has applied for immigrant visas twice and was denied, the reason he did this is because my father wasnt letting me petition for him to come here because he said i was too young and he wanted me to finish college first, but i convinced him that school is the most important thing to me and to my boyfreind. So he wanted to be next to me and tried to apply on his own...so i am scared that that will affect our chances of getting the visa and finally being together permanently... please help tell me your opinions!