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Generally, if the police were sure that you did damage to this vehicle, they would not be calling you to come and talk to you. They would just arrest you for a hit and run. When they want you to come in, it is typically to question you and get you to make incrimiinatory statements, which you can most definitely do by acknowledging the accident.
You have a fundamental right under the Fifth Amendment to the Constitution not to give evidence against yourself when you're the suspect of a crime. The police know that, which is why if they want to question you, they are supposed to give you Miranda warnings.
Police are skilled interrogators and they can twist your statements into admissions you'll be making against your interest. You cannot help yourself in a situation like this, but you can make it worse. The only way you should speak to the police about this incident would be if you have a lawyer with you.
If you don't go to talk to them, maybe the police will find enough evidence elsewhere to charge you, but at least you won't have made a confession and you won't have given away your defense.