Background check!

Hello I have a question I am not sure if I was convicted of a crime that was 11 years ago when I was 16 what should I do for application. I recently started my CNA and the proctor told me to mark no because I'm not sure if I had an actual conviction. I saw a judge and had to do community service that is all I remember. When I do my finger prints if it comes up I don't want them to think I lied but at the same time I do not remember if I was convicted or not. The court I went to will not release my file without a notarized disposition form. I already started school though so should I contact CDPH and tell them this so I don't get in trouble......