You brood of vipers, how can you who are evil say anything good? For out of the overflow of the heart, the mouth speaks. — Matthew 12:34

The Gospel is a treasure, but it's carried in jars of clay — fragile, ordinary, breakable vessels. That's on purpose: the surpassing greatness of the power belongs to God, not to us. Your weakness isn't an obstacle to God's glory; it's the stage on which His strength shines. So don't be ashamed of your frailty. The cracks in the jar let the light out.