Thank you Nun for the recommendation!
Styler83, Nun is right, you will need to file a US return as long as your income was above the threshold for filing (roughly 9K if you are single).
Fortunately you are in a really common situation, and one that is swiftly remedied by submitting the proper paperwork. The IRS also has programs in place now that make it easier than ever to get caught up on your taxes!
More than likely you will qualify under the Streamlined program, and that is the best way to get caught up on your US taxes. With the Streamlined program you can file the last three years of taxes, and up to six years of FBAR (FBAR's are needed if you have more than 10K in your foreign accounts).
There are a lot of great resources that explain these items in more depth on the IRS website, and also on our website (greenbacktaxservices.com) if you would like to learn more.
Let me know if you have any questions.
Good luck!