I’m grateful that @Motts can offer his/her input.
I’m also a teacher but an ordinary primary teacher, (s)he knows better than me the steps you can follow.
Anyways, I wanted to express you my support. The thing to do on your teacher’s part would be to ask you if you are having a problem. Never calling you off. And your mother should be grateful to have a sensitive kid and hear what you have to say.
Unluckily, there are people whose compassion could be equal to the one a stone has.