I'm afraid to be myself
Why are you afraid of being yourself?
I think my classmates might laugh at me and I'm afraid they will draw their weapons to hurt me once they do.
Tell the police if you think you will be attacked. It's not good to keep that to yourself.
I can't because I've seen my classmate watching me and they seem like they want to kill me.
If you believe you are in harm then you need to tell someone. Even if they don't harm you, they may end up harming someone else. Do you want to feel responsible if that does happen and you didn't tell anyone?