As a follower of Jesus Christ, God has equipped you with everything you need to tell others, even those who don't believe, about Him. Just make sure you saturate your friends in prayer and ask God for the words to say. Give God more credit! He is living in you and He will provide the words for your friends to hear. You have every right to be scared of saying the wrong thing because your words wont work. In fact, the words that get through to them won't be YOUR words, they will be His through your mouth! How exciting! Be encouraged, I will be praying for you and your friends!