Dude... I am the king wanting things and scheming like crazy to make it happen.
I know how u feel. but at some point you have to realize that you might have to wait and rethink your plan. If you can't get a bike loan then something is wrong. Dealers will do what ever it takes to make a sale. And getting a co signer is just asking for trouble. Relative or not. And even then. There is no guarantee that it's going to be a good deal.
I'm guessing this is your first bike. Save up the money and buy a nice used bike. We had a thread in this last week. There are TONS of good bikes out there and paying cash and owning your toys makes u look like and feel like a baller.