Get your credit report and find out what it telling creditor's. There must be a reason you are being denied? ( You have a job, right?)
Otherwise, it's easiest to get a store credit card (i.e. Express/Structure, previously Dayton's, etc). I started with a Dayton's credit card when I turned 18. I think my limit was like $500 or something. But I used it and payed it off each time.
You can obtain a FREE credit report annually now. It's required by law, here's the site:
https://www.annualcreditreport.com/c...ch%201,%202005
I did mine just last week, the only downside is you don't get your actual "score", you just see if there is anything negative on your report that has been posted. It's a good iidea to watch your report in case something has been submitted under your name, that is not for YOU. This happened to AJ, a bunch of his dad's stuff was on his report. (Sucks having the same name....) Anyway, this is why it's important.
So, now a few people have told you what to do. Let us know how it works out for you.