Question about a school break-in? Also, will this effect my career in Law Enforcement? Misdemeanor or Felony?

I think that you should stop worrying about it. No report was filed, and although it was a bad mistake to make, you clearly are not a hardened criminal. It's not like you lead a life of crime and have committed other crimes in the past. I don't think that an active investigation is being carried out, and everyone has probably forgotten about it. Don't let it happen again, and I'm sure that you'll be fine to have a career in law enforcement.