First you need to speak to an attorney in your area and determine what you can do to defend your case. Do not plead guilty at your court date until you have spoken to one for more than 5 minutes. The civil demand letter you received is separate from tbe criminal case and not paying will be unlikely to result in consequences. These charges add up over time with the fourth being able to be charged as a felony and they can hurt your employment prospects. Good luck.
You should speak with an attorney. If you qualify for a public defender, you can ask the court that one be appointed for you. Make sure not to miss your courtdate. There are various things your attorney may be able to do for you, so make sure you go over your case with at least one attorney.
You need to go over the details of your scholarships to see if having a misdemeanor conviction can affect it. If so, discuss this consequence with your attorney. The court does not actively seek out employers to let them know their employee has an arrest or conviction, but it may show up if your employer decides to run a background check.
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As you are 18, the odds are you qualify for a PD. Take advantage of it. If you had a broken arm you would see a doctor. Get a lawyer.