How to look intimidating
A lot of employees are intimidated by their managers, or students by their professors.
Someone may also be nervous around police officers, high-status professionals like doctors and lawyers, religious authorities, or employees who have power in a particular establishment, like bouncers or bartenders.
Some people come across as snobby and judgmental without intending to as well.
Once someone has moved on to college or the work world they usually don't run across as many tough guys.
The fear here is that these people are dangerous loose cannons who may kick your ass at any second.
Some people feel uncomfortable around their friends' or partner's parents.
Hopefully this answer isn't too unsatisfying, but I think in these cases the way to feel more comfortable around these people is to face your fear and just get more used to talking to them.They may speed or park illegally, smoke under age, or buy a fake ID so they can get into bars.