"Preach the Gospel at all times. When necessary, use words."-St. Francis (I know he's not an Orthodox saint, but I think it applies to what people have been saying about witnessing with your life. Life witness is less work on you and allows you to just love your friends (difficult as it is to always live out the full manifestation of that)).
I can say that I can relate to all of this. Everything from explaining Orthodoxy to my friends, my parents, my siblings, all the way to trying to explain the doctrine of theosis to a Pentecostal pastor. The thing I've found is that it is best (if not always easy) to just answer as best you can, let them process it and continue to be in fellowship with them (assuming goodwill exists between the two of you. If not, I would still advise seeking goodwill, but that's a separate issue).