I think everyone has been scared to share their faith, no matter what they tell you. I have been, most of the times are for the most ridiculous reasons to. A lot of the time it is just fear of being different (the thing is, as a christian we are already different) I'd much rather be classified as a christian than as a normal person of society, I love the concept of being a Jesus Freak, but just a few years ago, I would do anything to fit in, so sharing my faith was not something I enjoyed doing. now I simply share it when I feel God telling me to. I dont shuv it down their troats or anything I find it much more useful to ask them questions and get them wondering, human nature is to be inquisitive.