I am trying to get a loan for college. I have no co signer. anyone know of any legit loans?

I don't have any support from my parents and recieved the stafford loans but it is not enough for college. I have applied for a couple loans and my applications requires a co-signer (which i do not have) I have a good credit score but i guess i have little credit. I need about $15,000. to get me through school. anyone know where i can get a loan that doesnt require a cosigner?