Every person do mistakes in life. Every person experienced failure in life and that's a fact. Yes, we'll try, we fail, we move forward. That's life cycle.
If we fail it means we need more improvement to our selves. I know you're thinking that "I failed i need to stop" "Should i give up" or "Should i continue this" Yeah, we fail. But we need to improve, we need to be more better than before.
What should we do when we fail? ofcourse you need to be more confident to your self. Learn to accept your mistakes. And give your self a break. Take time to recover and start again. Then focus on what your doing. If we fail again just move forward this will be your lesson learned that you need to be more strong in life. Because life is like a Mobile Legends, we need to fight, we need to be strong before we win