You can't hide your attitude, and your attitude speaks volumes about who you are. It took me 26 years to realize the truth of this statement, a statement that in fact nobody told me about when I wish that they had. Perhaps it is an obvious truth of life that I've been oblivious to. Or maybe someone did tell me and I just forgot. Not that it really matters, anyway. What matters is this new personal insight to human behaviour, this realization that if you are bitter, negative, unhappy, judgemental, insecure or arrogant, you can't hide it. No matter how friendly, positive, and happy you pretend to be, the truth will come out in the end.
The only solution is to be the truth that you wish to be.