When I was younger I had a similar fear. Not that I was broadcasting my thoughts, but that others were able to tune in to my head and hear what I was thinking, and/or that people could tap into my vision and see what I was seeing. Consequently I was constantly trying to avoid thinking "bad" thoughts, and would occasionally think "I know you're listening...stop it!", and never wanted to look at anything "bad" or look at a woman for too long, for example, lest people judge me. I didn't constantly think those things, but they weren't infrequent, either. I think those thoughts and ideas was getting more into delusion territory.