After you file

Hello just read this whole thread. Im still kinda confused on everything so bare with me. Im in this thread now because I have made the same mistake as everyone else. Im 18 years old. Im pretty sure ive never filed any taxes before. I just started working about 1-2 months ago. So my question is what do I do if I marked the box as someone can claim me as dependent knowing im independent? I dont think I can do amend return because I havent filed taxes before. Should I just accept the fact that I played myself or should I wait. Also if Im working right now and pay taxes on every paycheck does that do anything? Will I receive anything next year. I dont know im new to all this **bleep** so please any information would help, thanks.