Will I be found guilty

Not specious IMO. No way to know if you will be found guilty.

You have no grounds for a lawsuit IMO, as you have suffered no damages.

You have not suffered any damages to sue for.

Yes the CO can do this......................

I’m

And?????????????????????????????????

At what point does defamation become a legal matter?

Being called a racist is not defamation. It is their opinion. They are free to not take you as a patient.

Can I sue a business if I took my car for repair and one of the employee is saying racial comments I asked him if he was racist

You have no grounds for a lawsuit IMO.

This sounds like a medical issue, not a legal one.

Are you in Germany? If so, you can get a pass to go on base and see a Legal Assistance Attorney, who can assist in locating him and advise you on...

How can I address this horrible problem without my parents knowing ?

The possession and distribution of child pornography is a serious crime. IMO telling your parents now will avoid significant legal problems later.