Check out this video:
It’s of course an advertisement. But so well done! The key point is not the t-shirt but the idea that thinking of yourself as the Main Character can impact your life and mental health.
I like both the video and the concept that I am a central character in my story. I would buy the shirt if not for the fact that I already have too many t-shirts — being a designer means that you get A LOT of free t-shirts.
Here’s the link to the t-shirt: Be A Main Character. I am not affiliated with them, I just really like it and I think it might even be helpful to see the reminder that you are the Main Character every time you see yourself in the mirror.