I also think that it depends on the person. As an introvert I find it hard to trust new friends, and people have hard time approaching me because of that too. It actually took me 3 years to open up to my friends and they sure were surprised to find out how active and talkative I can be. So it also depends on the people around you.
I was like that since childhood, there is no particular reason why. I was just calm and unproblematic first child. Maybe having responsibilities as an oldest child made me more conscious and serious, hence I am type INFJ.
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