Harnessing teenage fury: how my anger propelled positive change.

Anger is good.

Being angry gave me the courage I needed to take a stand for myself and make a change.

Here is a true story I never shared.

When I  was fourteen years old, I used to go to my harp class (I played harp for 10 years).
I used to go to my harp class twice a week. The teacher used to give me a hard time. Not attentive enough, not working hard enough, not motivated enough (just being a teenager lol).

One day, she yelled at me and threw my music score angrily on the floor. She told me to leave her class. 
I was hurt and angry.
Two days later, I had to go to the assistant's class. She also criticized me for not doing enough.
I had enough.

An emotional wave of anger hit me.
I put down my harp, told her I'd had enough of being bullied and went into the restrooms to calm down.
It took me 45 minutes to calm down and be confident in my value of being treated with compassion and respect.

I returned back to the class without a word, picked up my music score and left. 
She mumbled something back at me, but I didn't pay attention.

This life experience made me realize that anger can also be beneficial. 
In fact, my teachers never disrespected me again. 
Once and for all, I set my limits and stepped back to regain my confidence and peace of mind.

Did anyone have a similar experience with so called "negative" emotions?

I would love to know what you stood up for.