Yes, I do remember saying that I felt bad about not being able to witness to anyone during high school, but on the other hand it would be somewhat vain in a sense to imagine that their salvation would in any way depend on me or on anything I might say or do. The Bible says that no one can be saved unless he is drawn by the Holy Spirit. It is thus clear that their hearts are completely hardened and that they are not worth the effort on my part of trying to save. The Bible also cautions against throwing our pearls before swine, in which they are placed by default.