What would happen if I get caught with marijuana in school and I'm a minor?

I got caught with a little tiny piece of marijuana only enough for one to consume a hit. And this girl said to the school that I sold to her. Which I did not. The girl said 4 other people's names. And I had said I "sold" one time. But the cop kept switching back from the mall to school. And I got confused. I only gave a small amount to my friend one time in school and that's it. And I said I was selling to make it look cool, but I only gave a small amount to a friend to help him out. I have no charges pressed on me. The only thing they have against me is that girls word on me selling to her. And I didn't mean to bring he marijuana into school in the first place. I left it in my pocket when I went to sleep and forgot it was in there. I am 15 years old and a minor. I was thinking I would just get probation and drug and alcohol classes. But I am not too sure.