I used to work in a reputable company where most of the guys were looking very gentlemen and professional but they were talking behind me all the time without getting tired...,
That's because you are a wonderfully unique individual that everybody admires from afar.
...it was like if you suddenly start a life among tribes of Amazon jungle
You got me there. I cannot deny that the Poles who inhabit the Amazon jungle do indeed talk about people behind their backs. They are known as Polazons.
I also happen to know that there are Poles who talk about people in front of their backs. There is also a rare breed of Pole who talks about people when they are sideways from them. Most of them come from Zamosc.
edit: The harshest back talkers are those who use Polish sign language. They always look like they are waving at someone behind you.