"You're Not... but I AM"
We all have insecurities...
that voice inside you that says
"you aren't ____ enough."
To overcome these insecurities remember who you are is no where near as important as who God is.
Don't come to God asking for help with your purpose. Come to God surrendering to His purpose. Only then will you find yours!
Whatever your "____" is, know that God has it and through salvation we are one with Him.