Military
If you are having trouble getting a loan the military is a very good idea to try. Even if you don't get to fly with them after 4 years the GI bill would cover 60% if flight training costs at a qualified flight school. If the military isn't what your thinking of. Grants depend on income if you don't live with your parents there are a ton of grants to get, it just takes some research. I am also only 19 and I got a loan to go to Regional airline academy without a co-signer from key bank. You could try that. You could also go to college and get a job to pay for lessons.