I am 18 applying for a car loan, What are my chances?

I am applying for a car loan and I want to know what my chances are. I applied at a local credit union without a co-signer.I am 18 with a job paying maybe 1300-1500 a month and I am asking for 7,000 on a used car. I have had 2 credit cards for almost 6 months now witho out one missed payment. What are my chance s?