A friend that changed my life

I would like to write about a significant person (in this case – friend) in my life who helped me and motivated me in something I really wanted to do but I wasn’t so focused on doing that and my head was in a different place far away from it. My friend helped me rest myself and get on with what I needed to do.
This story took place last year, in the 11th grade, when I was in the class in a Tora lesson.
For the record, until this day I'm about to tell, I've never showed up in class in time, I was always late, and I've literally never bring the required equipment for the lesson.My teacher always had to fight with me about that, and yell at me: "why every morning and every class I have to ask from you to bring your material before the lesson starts?? I'm waiting…" he waited for me and I hated it, so I wanted him to continue the lesson and then I'll go, but he wouldn't listen. In the meantime the rest of the class was counting how much time it takes me to leave the class which made me even more angry.
One day, during the class, (I think it was the first class), my friend was sitting next to me, and the whole story happened again, but today it was different. During the fight with my teacher, my friend wrote me a big letter says: "learn already! Ugh! Learn!!" And I don’t know why but this note really got me. I looked at this letter and those words burned in my mind. So It got me thinking so hard, and I said to myself: "wait, what am I doing? Why do I act like an idiot? "
After this day I went back home and I looked at the letter for hours.
Thanks to my friend, I straightened up, started to come in class in time, brought my stuff and actually study. I can tell that thanks to him I got the high school diploma.
Just a footnote: when my friend wrote my the letter, it was jokingly.
He didn’t mean to say it seriously.
When I told him what it did to me he was shoked..
Thanks friend!