Help! Major issue, I signed a release for a comercial! Need help?!?

Is there a way I can get out of a release I did for a comercial displayed on the web? I am not happy with it and feel extra stupid for doing it, and am thinking of getting out of it if possible. It was involving another person too. I'm so depressed over it. I also don't have a copy of the stupid release form! What do I do? Also if no, what might you suggest I say word 4 word for him to agree to pull the video and or reach some agreement. (Not $ wise) Just agreement. Thank you for all your help!