“For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.”
Ephesians 2:10

He tells us we are God’s workmanship, specially crafted for a purpose and what this implies is that, in crafting us, he ensured we were well fitted for the task he was crafting us for and the Bible tells us:
“Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning.” James 1:17
That means he has made us durable, good and perfect for the task ahead.
In Christ, he has perfected us, and through his word we are continuously furnished and equipped to walk in his purpose for our lives.
The thought of not being good enough to do what God has called you to, should be far removed from your mind- you are his workmanship.