Ultimately, confidence comes
from the experience of competence.
When you don't get enough practice or exposure to cases, you don't feel like you can perform certain tasks. But even if you do and DON'T get reassurance that you are on the right track, you can still struggle to believe in your competence. If you don't believe in your competence, you don't feel confident.
Lack of confidence is uncomfortable, emotionally draining and makes you question yourself as a professional. You worry about making mistakes and quickly start to feel anxious, stressed and wondering if you should stop being a vet. All of this has a negative impact on your wellbeing and mental health.