What could happen in court for me? First offense?

In a matter of a week �a lot has happened. So last thursday I brought some Xanax to school obviously was not mine and usually I'll give a couple (NOT SELL) to 2 best friends because we like to have fun and schools boring haha and we are use to them. �Lately this girl Cheyenne had been hanging with us most the time and she said she likes to take some sometimes too. She asked for some but I lied and said I didn't have anymore because I didn't really know her and I didn't trust her. For about an hour she was begging for them practically on her hands and knees. So I said what the hell and gave her 2. Keep in mind she's 4'11 and weighs like 105. She took them and my friends took them. We where having a good time laughing and falling all over the place and being dumb. So we leave that class and I said bye to leave. I have a good day everything goes by smoothly. But then in my last class the dean gets me out of it and sends me to the police office in our school. They asked me what did I give cheyenne at first I say nothing but then they say oh well she's in the hospital and old her mom you gave her pills. I said okay yeah I gave her Xanax and change the story a bit. Apparently during one of her classes she was acting really messed up and out of it and they sent her home cause they knew she was in something. Her mom thought something was really wrong but she was just super messed up and acting loopy. Her mom asked her who gave the pills to her and she said I did. Well anyways she was fine and got out of the hospital. But the police checked me my bag and didn't find anything at all no evidence. They didn't even notice that I was intoxicated. So they arrest me and tell me they had to because legally she was in the hospital still even though they knew she was gonna be fine. Was that necessary? Anyways i go to juvie for a couple of hours and my mom comes at gets me and they tell me I have to go to court on july 11th. They tell me I'm suspended from school until a parent conference. I had the conference yesterday and the school says I'm expelled and I have to go to a behavior school in fall for 9 weeks, then I can go back to a different school. Also takes substance abuse classes. So I am scared this is my first offense and I'm 16 what could happen to me? I'm sorry for the long description!