Criminal Law Questions? Ask a Criminal Lawyer.
Have you been charged with a crime? If so, did they charge you with all three or just one?
It is unlikely they will be able to use the admissions (true or not) since they have no other evidence of any prior crime. You generally cannot convict someone of a criminal act based only upon a confession.
You can argue that the statements were untrue and only given in an effort to avoid criminal prosecution. While private security and store personnel are not held to the same standards as police officers, you may be able to negate the statements factually.
At this point I think it is important that you consult a local attorney and speak to no one else concerning this matter until you have a lawyer. Obviously your lawyer will need to research the issues concerning these statements that you made and hopefully develop a suppression issue that can be used to keep them out of the courtroom. If that is impossible then your lawyer will want to take steps to demonstrate the statements were only made to avoid prosecution and were untrue.
Please reply if I can help further.
Let your lawyer make that determination. The only thing that would help is to show how nervous and agitated you became during the questioning and that you would say anything to avoid further prosecution... this can cut both ways with a judge. So leave that issue up to your lawyer and make sure to discuss it with him/her.