go to irs.gov
they have the forms you can print. also links to places you can e-file for free. (not everyone is, but you should qualify.) Online. And have your refund direct deposited. TurboTax is one. I've used this service for the past several years with no problems.
Just make sure you don't "declare yourself" and only take the standard deduction Boston Red said. You should get some, if not all. of it back.
I wouldn't invest in software if I could file 1040EZ. It's a 1-page form. Either way, I'd do it today, while I'm thinking about it. Just make sure you everything ... including interest income if you have savings.
Don't forget you may get your state tax back too, if you paid any.
Welcome to the spring madness.