How do I stop tilting in Tekken?

I (19m) only ever quit tekken either by smashing my controller till the batteries fly out or frantically disconnecting before someone can beat me.

I just got demoted from Eliminator to Destroyer after a 9 match losing streak. I bashed my controller so hard against my desk that it nearly shattered and chipped part of the wood, and I ended up just sobbing for half an hour screaming at myself. The whole time I was just thinking:

"YOU ARE SUPPOSED TO BE BETTER THAN THEM YOU WORTHLESS LITTLE SHIT. ALL OF THIS EFFORT AND FOR WHAT? WHAT IS WRONG WITH YOU? YOU ARE BETTER THAN THEM YOU ARE SUPPOSED TO DO BETTER THAN THIS. WHY CAN'T YOU JUST DO WHAT YOU'RE SUPPOSED TO DO?"

I feel like a pathetic child whenever I lose because all I ever think is "I AM SUPPOSED TO BE BETTER THAN THAT. I AM NOT SUPPOSED TO FAIL."

For context, I struggle extremely hard with self-worth. I never, ever feel happy unless I am better than someone else or I am clearly winning against someone. The only time I feel like I am a good person is when I am better than someone else. I will also never take any risk of learning any kind of new technique in TK8 if I am losing. For example, I never rematch anyone that beats me, partially due to rank loss.

I usually end up insulting people or screaming at people in the text chat until I eventually come to my senses and realize all of the time and effort I just wasted. Realizing all the time I wasted just makes me feel worse.

So, I am turning to here. How do you guys not get tilted, and what is any advice y'all might have for me to help with this?