What is your phobia/fear?
Everyone has fears, otherwise known as phobias. My phobia is actually pretty funny. I've had this phobia already since kindergarten. When I see one of my friends that are older than me at school, I usually think of saying hello to them. Everyone does, it's kind of like an instinct, to say hello to a friend you see. However, before I say hello, I have to think first. For example, A is my friend and B is my friend's friend that I don't know. When A is with one of his/her B's and I say hi to A, A would make this face at me as if he/she is really annoyed with me even if A doesn't do that normally. To make it even worst, B would make a face also and say "Ugh!" and roll her/his eyes at me which I hate people doing. Then, after I turn around, A and B would whisper at each other. I don't know if A and B is whispering about me but I bet they are and even though I've turned around, I know they're whispering. In other words, I don't have the guts to say hi.
This might have happened to you when you were still at school or even now. Maybe some people also have a phobia of this happening. Phobias could last for a lifetime and this one could probably scare me forever.