It is ok to fail and commit mistakes, that's part of the game, specially for beginner devs. Just avoid failing alone, the most you can!

I mean:

- Ask people to review your code before pushing to the source repository.
- If you are not sure how to do, ask.
- Never work in production environments without supervision. Pair with someone.
- Have a desk mate for rubberducking (https://en.wikipedia.org/wiki/...) and blame it in case you need