Oh I definitely agree! People and their personalities change all the time, but the Myers-Briggs part is only one side of a person. Like others have mentioned it is not scientific, but it can still serve as a way of understanding and working on yourself (your mind), without drawing the conclusion that your mbti has changed. For example, if you are an INFJ, like me, your auxiliary function is Fe, extroverted feeling. So if you are feeling more extroverted it could mean you are more in touch with your auxiliary function. This is why so many INFJ's are mistaken as extroverts. However, this is just one example. If you think that considering yourself 50/50 INFJ and ENFJ works for you and helps you then that's fine. But if that's only because an online test says so I strongly recommend you to read about the functions of both personality types. That's what helped me a lot too! And I'm also an INFJ and I have a stutter. I wish you the best of luck and sorry for the long comment. :)