If your tax situation is not complicated, you can do it yourself for free. Google around for "file taxes" and pick one. TurboTax for example. Then you just create an account, answer a few simple questions, and copy numbers over to it from the W2 you received from your employer. Then click submit and you're done. Shouldn't take more than about 30 minutes from start to finish. You will get your tax refund from the IRS in a month or two.
Don't worry, it's not difficult. The tax software takes care of all the complicated stuff for you

. If you're still worried then ask a family member, friend, or co-worker for help

.