I'm being groomed by my teacher (active)

Okay, so, I don't know how to start this. I know, a lot of adults are going to say to get off the internet.

I'm 13 years old and I'm in eighth grade. My teacher, I'll just called her B for now, has been doing very bad things to me.

It started out slow, like gently touching my shoulder, like most teachers do to comfort kids. But then it started to get weird later on... Like, she started to touch me more. She started to touch my shoulders more thoroughly, and started to touch my arms, forearms, legs, knees, thighs, back, lower back, and neck.

I don't know what to do, I'm 13 and scared. And I'm also scared to tell the other adults and my mom. Like, what if they just say I'm being dramatic and I get in trouble??!!

I keep overthinking and crying to the point I'm dehydrated and hungry all the time.

I was also in foster care and the foster mom would abuse and neglect me. B knows this because it's permanently in my records, and takes advantage of this.

Please help me, i'm so fucking scared. This has been happening since the beginning of the school year and since it's almost over, I really want to say something but I'm scared to.

Someone please help me i'm so scared