You don't have to be nice to everyone all the time. It's better to be grumpy, opinionated and even a nay sayer sometimes than to fake smile through everything.

Because doing the later can give you physical symptoms like real back pain and migraines (collectively known as TMS) and millions of people suffer from it, get surgeries, medicine yet don't know that their persona is the cause of their physical pains.

This is what I learned the hard way after suffering from such aches and pains daily for nearly two decades and geting better quickly by just understanding the most basic thing about how our mind and body works.