[header] How to be a tough girl [title] Be your true self. [step] If you want to be tough, you first have to start accepting yourself for who you are. If you prefer staying up late to read science-fiction, as opposed to keeping up with the hottest television show, so be it. 
If a group of people think something's funny, but you don't, so what? Pretending to be someone you're not is an obvious sign of insecurity or weakness. People can easily pick up on it, and you surely won't look so tough if someone calls you out on it.