I'm sorry, S.E. I utterly despise it when you tell someone something assuming they'll keep it in confidence, and then go blab it to the world.

Since your class as a whole seems to think this, there's not a whole lot you can do. My best advice is when people confront you about it, explain it as calmly and rationally as possible. Present it in it's plainest terms, and show it's really not a big deal, and explain how lots of kids/people experience this. Over time you're actions and personality will show this isn't true, and it will eventually be forgotten. Just keep your head held high and show them the true person you are, the person I know and love! 

Here's an idea:

Information is powerful:

You could do a presentation about the science of ADHD, and explain that you only have a minor case, and you're not going to blow-up, or something.

You could also list all the celebrities/famous people and heroes (Percy Jackson, etc...) who have ADHD.

You could even say that you know a really cool person who has a worse case of ADHD:

My Science teacher has ADHD, and she became an Olympic athlete and placed 15th out of the world in cross-country skiing.

Well, good luck, and let us know how it goes.

~Kate-the-Great

Walk up to him and say, "Dude, you're a jerk. I thought I could trust you, but you HAD to go and blab to everyone else, ruining my life. Thanks a lot." Then leave, never talk to him again, and try to find people that think the same way as you. If you can't, well, just find friends in us internetrers and books. If someone tries to bother you, give them a look like Shut up. Go away. I don't want to hear it. 

Don't socialize with "sane" people. "Sane" people are complicated. It's best to avoid excessive interaction with them. They do things like what your "friend" did. So find people who think like you. Find refuge in them, the internet, and books. I have a life similar to that at school.

Good luck avoiding "sane" people.

Sometimes I hate all the labels we get, like, if you say that you have ADHD that you're weird. I'm pretty sure that I have a mildcase of ADHD just my own suspicions, and I certainly used to be OCD, when I was younger, but I mostly got over that.I've never told anyone this because they would think I'm crazy. I don't have much experience with this kind of thing, but I would say that if you have a chance, to try and confront everyone and explain to them what you actually have. Also, I think I remember you saying the you are going to a diffrent school next year, if so, then you get to leave everyone soon if worst comes to worst.

Thank you!!!

Eesh. I'm so sorry. I had some depression issues as well. AND I have a TON of friends with ADHD. I actually think that I might have something of that sort! Try either talking to your parents. Or ask your teacher to talk to the class about ADHD. YOu could also (If your doing a class talk or presentation) explain what ADHD is and how it's normal for people have it. Or write a ist of most common habbits of people with ADHD. Who knows? Maybe some ther kids in our class have it! You should probably ask your parents or teacher for help with the issue of the class thinking your weird because you had some deppression issues.Try branhing out and try to find friend who don't care about your problems. I'll be praying for you pal!!!