Unsubsidized Loans...where can I apply for one?

I've already applied for financial aid through my college and have a subsidized and unsubsidized loan, but its not enough. Do I need to tell the college to get more or can I not just apply myself somewhere? I don't have good credit, hardly any and I don't have a co-signer, so I can't go that route. Any help would be useful. Thanks!