I need to find a student loan I can take out by myself, without a co-signer. Where can I find them?

My parents are unable to co-sign for a student loan. My mother is co-signed on my brothers student loan and he is not paying it like he should be, so she doesn't think she can co-sign because of that. My step-dad is unemployed at the moment. and my father is self-employed and doesn't have that much income and hasn't filed taxes in years. so therefore I need to apply for a loan by myself. Any help?