In Texas, 17 is an adult for criminal charges.You can't change the charge or the sentence.Many offenses fall under several charging categories. It's up to the District Attorney to decide what specific charges will be filed, with the condition that they are indictable and all elements can be proved 'beyond a reasonable doubt' at trial.If this was a plea bargain, when you were sentenced, you admitted you committed the offense as charged.PS: A Class C misd is just above a traffic ticket, carrying a fine of up to $500. It is highly unlikely that discharging a gun from a car would be considered a Class C 'disorderly conduct'. It sounds as though they charged you with a State Jail Felony, which is between a misdemeanor and felony and you possibly violated probation and did the two years in jail.