I feel so embarrassed and guilty. Possible TW: sexual assault

I guess I just need some advice about this.

I'm currently 14 and towards the end of last year I was sexually assaulted by my physics teacher.

He found any excuse to touch me, he would touch my legs during class and he would always ask me to stay after class.

I'm a straight A student, so he would purposely mark me down on tests and ask me to stay with him after class, and he would touch me in order for me to get my actual marks.

I told 2 of my closest friends who told me to tell someone else like a parent, but I refused to and just tried to get over it by myself.

Now my mom thinks something is wrong, I guess it's just a mom thing lol. But it's almost as if she knows about it. She has asked me 4 times if something like that happened, and I've denied it all 4 times.

I feel so disgusting and embarrassed for letting him do that, and I'm scared of Male teachers now.

I also feel so guilty for lying to my mom about it. And I feel like its destroying me from the inside out.

Anyone have any advice for me?

Thanks xx