Hello Mark, it is a real fun to read your story.
There are many other versions of your stories that many of us learnt or programmed into our lives and we carrying on for the rest of life. So next to our leaning and as the second learning at school will effect and shape of life for the rest of our life.
Thank you for being so brave for sharing your story and you are not alone.
I also have some thing to share here about myself.

I am very bad at counting and numbers. I hate numbers and I failed in Maths and /mathematics and applied maths in my earlier stage of academy. So I am very weak in accounting etc.
All those things happened when a primary teacher knocked me harder on my Head while we were in a teaching session. He hurted me on and he was a narcissistic teacher. So that fear was settled into my genetic as a programme. so I was carring that fear as a defence to keep the numbers away from me. I had discovered it roots only when I was learning about NLP and found out the memory I carry around through my life.
Yes it is easy to get rid of those memory in our sells of body/ mind that could adjust" to new thinking or as Programmes to remove any difficulties and get to where we want to go next. There are so many books on NLP ( Neuro -Linguistic Programming ) ( As EX. This book is my recommendation to read. "NLP the New Technology Of Achievement " just have a a look at those many books and you can get something helpful to feed and refresh your mind. So you can arm yourself to kick off all your OLD THINKING THAT runs as programme to move your life.
There are no side effects of doing something differently reading books.

ACTUALLY WE NEED THE RIGHT SIDE-EFFCT TO CHANGE OUR MIND SET. Just have a try.

Just send me a Pm and I can send you some supply Ex. kind of pen/ fountain/ Straight holder/ and some nibs to try. Also a calligraphy book of fun writing/ I have one to give away. I'll do it free and I'll send it to you when I am free and when I find time to bundle all together.
I am happy to do that and all you have to do it write some mocking letters addressing that teacher G and to showing by your own writing to make he / her jealous. ( I think you'll find many ideas From This NLP reading and similar things from some books.
Also if you Have websites/ Face book /Instagrams/ or social media/ to put your written letters someone as anonymous addressing as written letters your hands will get starting to be easy shuffle and light. Or you can write the letters and destroy or burn. That works too.
Good luck on learning your wring power and it is not something given by anyone but gaining by yourself and taming your hand to achieve it.
God is within you ..

and you have to find a way tap into him.

Keep writing Mark.