If you were to witness an accident and were interviewed by a police officer afterward, you would be expected to state the facts. You are not to embellish your testimony or make it more entertaining or more interesting, and you are not to adapt it to your own particular point of view. You are to simply tell the officer what you had seen.
The apostle Paul told the elders of the Ephesian church,
"You know that from the day I set foot in the province of Asia until now I have done the Lord's work humbly and with many tears. . . . I never shrank back from telling you what you needed to hear. . . . I have had one message for Jews and Greeks alike—the necessity of repenting from sin and turning to God, and of having faith in our Lord Jesus." (Acts 20:18–21)
As Christians, we are to give testimony of what we have seen. The apostle John wrote, "We proclaim to you what we ourselves have actually seen and heard so that you may have fellowship with us. And our fellowship is with the Father and with his Son, Jesus Christ" (1 John 1: 3).
It seems to me that if you are walking with God as you ought to, if you are spending time reading His Word, and if you are growing spiritually, then you are a witness. Your testimony simply will overflow from a Christ-filled life.
But if you find that it is a hard thing to work yourself up to tell others about Jesus, that doesn't make sense to me. It should just overflow from your life as a follower of Christ.