For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek. For in it the righteousness of God is revealed from faith for faith, as it is written, "The righteous shall live by faith."--Romans 1:16-17 (ESV)
Do you feel too week to evangelize? I do sometimes. We are weak, flawed human beings, not God. To bring someone to Christ requires more power than we have. What do we do?
Thank God, we don't have to do anything. Why not? Because the gospel is God's power. His power is not found in a raging waterfall or a blazing supernova, but in the Word of Christ.
You have nothing to be ashamed of. Preach the gospel boldly and watch God's power work on the hearts of those around us.