i was caught shoplifting 10$ worth of items and i gave everything back and they said dont come back can i come back if im only coming to buy stuff

I would not go back. It sounds like you were given a Criminal Trespass Warning (CTW). These warnings are usually indefinite, meaning you can never go back to that location (or possibly all locations of that store depending on what the CTW says. Sometimes the warnings only last a year or two, but the police typically give you a piece of paper stating the location, the date and time of the CTW, and how long it lasts.  If you were given a CTW and the police catch you on the premises again, you could be arrested for a class b misdemeanor of Criminal Trespass. It is not worth the risk, whether you are shopping legitimately or not, you are not allowed to be there. I would shop somewhere else.