I ratted..

So heres the deal. My best friend Brought weed and smokes to school.

And Me and her help in the kindergarden class at lunch time. When the teacher left the room she opened her back pack and showed me weed/smokes. I thought it was compleatly wrong. So I went back to class and told my best guy friend. I thought only he could hear but turns out others could too. They soon went and told lunch room teachers. I was pressured to go to the office and rat. But I got there and I was sitting down for about 25 minutes waiting for the principal to come back. turns out they already told. She came walking down with my best friend and Asked me why I was there waiting for her. I said I came to report her. My best friend looked at me with sad eyes and I realised what I had done. My friend got expelled shes is in rehab and juvie and had a fine of $485. Im being told I should Move/ switch schools because I ratted. My best friend was always the quiet one. Never talked. but outside of school she did it all.. Im extreamly sad about this all And I need help coping and with how I can talk to people at school about it. Any help/suggestions?