John 4:42 (NKJV)
Then they said to the woman, "Now we believe, not because of what you said, for we ourselves have heard Him and we know that this is indeed the Christ, the Savior of the world."
The woman at the well had an encounter with Jesus Christ and became a believer. She was so excited that she went to tell others about Him and they believed too.
When I tell others about Jesus, my goal is not for them to be impressed with me or to trust me. Eventually I will disappoint them and let them down. My goal is for them to be impressed with Jesus Christ and to trust Him. He will never disappoint and He is always trustworthy.
Don't just tell people about Jesus, introduce them to Jesus.