PLEASE HELP I NEED IT URGENTLY?

Mate you're not going to get anywhere by just wondering. It's all or nothing at this point. Don't worry about the teachers. They're probably just teasing. My 7th grade teacher knew about the guy I liked in our cl and he teased me all the time. Just go for it! What's the worst that can happen? She says she doesn't feel that way about you. If that's the case then just move on, and find somebody else who does. You're young. It's Highschool/ Jr. High. Life goes on. To be completely honest you're not going to remeber any of this 10 years from now. Good luck and I hope things work out with you and this girl :D