There are so many situations where you will be uncomfortable in jiu-jitsu and want to give up. That’s especially true when you first start learning, but giving up in the gym and giving up in a tournament is different. We all have pride. We want to win, and that desire will push you to persevere, even if it’s just a little, but every time you do, you’ll learn that you can go further.
In a way, you get desensitized to difficulty, and you start to realize that there is often a way forward even when no path seems visible. That is a change in mindset that you gain as you compete more and more.
Over time, you become confident in yourself, and your experience helps you calmly assess situations and move forward with the hand that you’re dealt. It’s possible to gain that same perseverance elsewhere, but competition is one of the safest environments to do so.