I get that feeling whenever I walk across the streets since I have an irrational fear of getting hit by a car >_>. I also get that feeling whenever I'm bold enough to share my opinion or what I want since IRL that doesn't always end well, that's why I'm rather comfortable and actually prefer to be submissive and passive
http://www.livryan.com/wp-content/uploads/2015/04/girl-with-hand-up.jpg