How can I know if I am not infj

The first time I did the mbti test I got infj and it was so perfectly aligned with me but after four years now I am 19 its getting harder for me to recognize myself each time I take the test smth new appears then I go back and read about infj and I am like what am I doing wrong

How can I tell if I am not infj so I can be more critical since if it's how to tell if I am I will probably try to find a way to make it fit