Thank you for the question on confidence, “Is there a Bible story about confidence?”
The Bible narrative records many men who lack confidence in serving the Lord, but the Lord encouraged them to be his servant.
Here are some stories that one can read about the lack of or having confidence:
A. Moses when God called him to deliver his people (Exodus 3–16).
B. Jonathan and his armor bearer attacking the Philistine (I Sam. 14).
C. David when he fought Goliath (I Sam. 17).
D. Nehemiah when he built the wall while facing opposition (Nehemiah).
E. Daniel and his three friends (Dan. 3–6).
SUMMARY: The Biblical narrative is about how God’s power is demonstrated in the weakness of his servants.
-Kingston