It's About Relationships
For many Christians, a primary reason evangelism is intimidating is that they do not have a context to share their faith. They do not have meaningful relationships with any unbelievers. In a true friendship, conversations about things personally important (like Jesus and the gospel) are much more natural. For many of us, seeking to love, show kindness, and establish friendships with unbelievers is the first step toward seeing doors open for the gospel. Jesus spent quality time with lost people. Drawing the anger of the religious leaders, he shared many meals with sinners (Mark 2:16-17). Why? Because he loved them. Part of fulfilling his mission to reach the lost meant spending quality time with them. The same is true for us. It's about relationships.
Please consider this brief article by David Phillips - "Beyond the Guilt of Not Evangelizing"