That's not true at all.
Comparing to 2 year and a half, I am living prove of the subject it was meant to be shown by image.
However, some of the people which are close to me heard many times this, and that is:
"I have only improved myself, I never changed who I am"
Philosophy is the area where 'I have been made' and I am sorry 2-Pac, people can only improve, they can't change themselves.