Plz help!! hit and run accident?

I'm 17 and this morning I was driving to school and only hd 10 minutes left. I was in my lane but there was a garbage truck on my right and very close to my lane. I accidentally hit the side of it and heard a noise but continued thinking that I won't have any damage. I know it was wrong but today was the first day of midterms and i didnt want to be late. when i got out of my car there was much damage on my right side. I don't know what to do, insurrance, i already told my parents btw. but what should i do plz help