yes, if you leave then you compound your punishment by adding a felony charge of runing form the police. You will still be charged with a hit and run ither way but not reporting to the police will add a lot of time in jail, and a large fine too.
You have a moral and legal obligation to report the accident. If you fail to report it, and you were seen, several charges can be made against you, including hit and run, and leaving the scene of an accident.