Affiliate Marketing Secrets

I need to have a student loan for 50,000. I applied to both of the lenders that my university works with and both denied me but said I would be approved with a credit worthy cosigner. I have excellent credit in the 800’s. I’m only 24. i own a quiznos franchise. i have a bachelor’s degree. why can’t i get this loan for nursing school? i tried to get it from a few other banks, however, most only work with schools that they are affiliated with, which means i pretty much have to go with the people my school offers salliemae or wells fargo. the only reason i could think of y i might not be able to get the loan is because i am a guarantor on my 50,000 dollar business loan for my corp.
is there anything i can do? is it anyway possible for me to be able to get a loan on my own? i even tried to get it for less money, and still denied. and i have no one to cosign for me. can anyone out there advise me or give me any info whatsoever???