When you encounter unbelievers, be wise. Conduct yourself with wisdom in your interactions with them. Make the most of each opportunity to share the Gospel and the Good News to them. Have the heart to share so that they will also inherit the Kingdom of God.
Of course, all of us wants our friends to be with Heaven with us real soon. If they didn't have Christ yet, share! Don't hesitate, don't fear. Don't be ashamed of the Gospel. And lastly, pray about it. Ask God for wisdom on how you handle this concern and He will help you.