How far you get in life is determined by your mental fortitude. It doesn’t matter how strong you are physically if you can’t handle the pressure or quit. It doesn’t matter how smart or talented you are if you can’t persevere through a little adversity. The most talented people aren’t always the ones who win out in the long run. It’s the ones with mental strength who win.
Re-train your brain. Get used to living in your discomfort zone. Monitor your thoughts and don’t believe everything that you think.
There’s a difference between “I Can’t” and “I’m not willing to do whatever it takes to do this.”