Positive vibes must be psychologically inside the human being if they are there that means they are positive if they are not there that means they are negative<< Nobody knows about that except the person itself>>
for example,, You may see someone and he looks sad to you because he doesnt show any signs of happiness, You are going to tell yourself automatically that he is sad. (but he is happy)
the other thing you may see someone eho looks very happy but in the fact he is very sad.
SO being positive is for yourself and the need for other people to know that or not will not change anything.
and Being Negative is the same thing,