Yes, I've done this before. I don't think its serious or anything, just silly paranoia. Sometimes, I think a certain thing about someone, think they know what I'm thinking, and then, to check if they are a mind reader, tell them mentally to blink their eyelids twice or something like that. Then, when they don't do anything, I think, THEY'RE ON TA' ME! But fortunately its not a constant thing for me, just happens when I'm particularly anxious.
Alone is what I have. Alone protects me.
No. Friends protect people.