Even if you don't know why you are uncomfortable, change your plans, move away from the person, get out of the area - whatever is necessary to make the feeling go away. Know yourself .
Every situation is different.
In any annoying or dangerous situation, you will be the best judge of what you need to do to handle the situation. The following are some options which women have found effective. Show your anger, not your fear . Remember an attacker wants an easy victim and will frequently back down from the prospect of a fight. Yelling may be one way of demonstrating your anger.