"Get up and get dressed. Go out, and tell them whatever I tell you to say. Do not be afraid of them, or I will make you look foolish in front of them. 18For see, today I have made you immune to their attacks. You are strong like a fortified city that cannot be captured, like an iron pillar or a branze wall. None of the kings, officials, priests, or people of Judah will be able to stand against you. 19They will try, but they will fail. For I am with you, and I will take care of you. I, the LORD, have spoken!"
Now what exactly is it that you are afraid of? Do you think you don't have the right words to say to someone different? Are you worried that they'll be like "He's a Christian! LET'S KILL HIM?" LOL Not in a million years would that happen. But the point is you don't have to be afraid of anything. Fear is just a lie. It's Satan telling you that you might be in danger. Romans 10:13 says "Whoever calls in the name of the Lord will be saved." All you have to do is call in the name of Jesus, ask him to get rid of your fear, and he will do it. But don't just simply say it like "Jesus, save me from fear. There I did it, now let's do whatever." It won't work that way. Instead, you have to really get into his presense. Close your eyes, get an image of Jesus, and really talk to him. That is how we pray. Keep doing this, and you will be free from fear and ready to spread the word. :)