Help, I'm scared. Minor hit and run....?

I am a junior. I drive a big mini van and this boy next to me drives this huge truck. he pulled in too close to me today and as I was pulling out, my right side smacked into his. I wasnt going fast but you could hear the noise. So I backed up, I hit it more. So I tried turning my wheel and hit it more. So then I changed directions and gunned it and of course hit the truck even more. I was scared so I left the parking lot and I know that is totally the wrong choice. The reason why I was so scared is because if I lose my license I have to return back to my old school which I cannot do...I transferred for a reason. Also, I dont have the money to pay for anything because I dont' even have a job. I have applied to so many places but no luck yet.I am in a screwed situation. But this kids truck looks like a brand new white truck. It's really nice. He didn't see me do it but I am SURe other people did and if there is green paint he will know it's me. Should I report myself tomorrow at school before he does because I really do feel bad. So bad. or should I not and just hope he doens't know who did it? I am scared out of my mind. I have never sped or done anything bad. I am responsible with my license. Wednesday I will have had it for 6 months. I didn't mean to screw up. Please. I just need advice. I am not a bad person I am just scared out of my mind but I also have a conscience. I want to do the right thing and I know every action has a result but ah I don't know. I just need advice please. I really didn't mean to do it but this kid is a jerk. I just need help!