If I accidentally claimed myself on my taxes and I'm a dependent of my parents what should i do?

[vdemarinis]

I also already received my tax return.

[Texas Roger]

You need to amend your return. Since your return was accepted by the IRS, you must prepare, print, sign and mail an amended tax return form 1040X to correct the problem. 

DO NOT change your original tax return until you start the amended return. If you have already changed it from the way it was originally filed and accepted, you must change it back before you start the amended return. Wait until you receive the refund from your original return before beginning your amended return to make sure you enter the correct amount. Here is an FAQ to help you:                                                                  

https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed

[Texas Roger]

There is a box to check in the Personal Info section that says someone else can claim you as a dependent.

[BobB7]

In addition to amended your return, you need to tell your parents that they will be unable to efile this year because of your error.  Amending your return will still not allow them to efile.  Probably an apology is in order!