The best way to do so is by stating your claim, and use evidence to support it. If there is no evidence to support your claim, it is simply just an opinion and people will have no reason to think you are right.
Hope this helped, have a good day :)
The author is trying to get a nervous or scared feeling
Yes, there have been many times when you have to lie to get out of a situation. For example, I remember a time when I was being asked humiliating questions by a total stranger, so I lied and said that I had to go due to family issues including my mother. It is okay to lie in uncomfortable situations.