A few years ago I made a list I keep adding to and editing. It reminds me that God can always use me, despite my imperfections.

Noah got drunk.
Abraham lied about his wife.
Jacob was a swindler.
Moses stuttered.
He also had an anger problem.
Hosea married a prostitute.
David had an affair.
Solomon had a bunch of wives.
The woman at the well had a bunch of husbands.
Naomi was a widow.
Sarah was too old.
David was too young.
Miriam was a gossip.
Jonah ran away from God.
Thomas doubted.
Jeremiah got depressed.
Elijah got burnt out.
Martha was too busy.
Timothy had stomach problems.
John Mark was rejected by the apostle Paul.
Moses was a murderer.
So was David.
So was Paul.
Peter was afraid of death.
Lazarus was dead.
So was Jesus.